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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2018	Oct. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	UPWK
Entity Registrant Name	Upwork Inc.
Entity Central Index Key	0001627475
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		106,299,106

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash	$ 27,055	$ 21,595
Funds held in escrow, including funds in transit	107,479	87,195
Trade and client receivables – net of allowance of $2,703 as of September 30, 2018 and $1,577 as of December 31, 2017, respectively	41,592	30,762
Prepaid expenses and other current assets	5,326	4,574
Total current assets	181,452	144,126
Property and equipment, net	6,260	3,514
Goodwill	118,219	118,219
Intangible assets, net	6,671	8,672
Other assets, noncurrent	6,240	658
Total assets	318,842	275,189
Current liabilities:
Accounts payable	5,471	462
Escrow funds payable	107,479	87,195
Debt, current	29,594	10,342
Accrued expenses and other current liabilities	16,911	16,030
Deferred revenue	717	614
Total current liabilities	160,172	114,643
Debt, noncurrent	19,304	23,491
Other liabilities, noncurrent	6,110	1,936
Total liabilities	185,586	140,070
Commitments and contingencies (Note 5)
Redeemable convertible preferred stock, $0.0001 par value; 76,141,345 shares authorized as of September 30, 2018 and December 31, 2017; 61,279,079 shares issued and outstanding as of September 30, 2018 and December 31, 2017; aggregate liquidation preference of $120,047 as of September 30, 2018 and December 31, 2017	166,486	166,486
Stockholders’ deficit:
Common stock, $0.0001 par value; 150,000,000 shares authorized as of September 30, 2018 and December 31, 2017; 36,945,317 and 33,740,323 shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively	4	3
Additional paid-in capital	104,900	92,222
Accumulated deficit	(138,134)	(123,592)
Total stockholders’ deficit	(33,230)	(31,367)
Total liabilities, redeemable convertible preferred stock, and stockholders' deficit	$ 318,842	$ 275,189

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,703	$ 1,577
Redeemable convertible preferred stock, par value	$ 0.0001	$ 0.0001
Redeemable convertible preferred stock, shares authorized	76,141,345	76,141,345
Redeemable convertible preferred stock, shares issued	61,279,079	61,279,079
Redeemable convertible preferred stock, shares outstanding	61,279,079	61,279,079
Redeemable convertible preferred stock, liquidation preference	$ 120,047	$ 120,047
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	36,945,317	33,740,323
Common stock, shares outstanding	36,945,317	33,740,323

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 64,113	$ 52,262	$ 186,012	$ 147,793
Cost of revenue	20,504	16,894	60,578	47,847
Gross profit	43,609	35,368	125,434	99,946
Operating expenses:
Research and development	14,377	11,514	40,680	32,519
Sales and marketing	18,967	13,626	55,054	37,327
General and administrative	11,707	8,952	34,102	25,415
Provision for transaction losses	1,892	1,073	4,612	2,857
Total operating expenses	46,943	35,165	134,448	98,118
Income (loss) from operations	(3,334)	203	(9,014)	1,828
Interest expense	589	199	1,674	629
Other expense, net	3,423	260	3,845	75
Income (loss) before income taxes	(7,346)	(256)	(14,533)	1,124
Income tax provision		(45)	(9)	(56)
Net income (loss)	(7,346)	(301)	(14,542)	1,068
Undistributed earnings allocable to preferred stockholders				$ (1,068)
Net loss attributable to common stockholders	$ (7,346)	$ (301)	$ (14,542)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.20)	$ (0.01)	$ (0.41)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	36,069,502	33,298,773	35,129,250	32,760,339

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (14,542)	$ 1,068
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for transaction losses	4,612	2,857
Depreciation and amortization	3,542	3,135
Amortization of debt issuance costs	64	40
Change in fair value of redeemable convertible preferred stock warrant liability	3,610	41
Stock-based compensation expense	5,667	4,817
Loss (gain) on disposal of fixed assets	33	(3)
Changes in operating assets and liabilities:
Trade and client receivables	(15,137)	(7,239)
Prepaid expenses and other assets	(658)	183
Accounts payable	5,006	662
Accrued expenses and other liabilities	(490)	7,833
Deferred revenue	103	56
Net cash provided by (used in) operating activities	(8,190)	13,450
CASH FLOWS FROM INVESTING ACTIVITIES:
Increase in restricted cash	(94)	(1)
Purchases of property and equipment	(1,598)	(1,509)
Internal-use software and platform development costs	(2,670)	(392)
Net cash used in investing activities	(4,362)	(1,902)
CASH FLOWS FROM FINANCING ACTIVITIES:
Changes in funds held in escrow, including funds in transit	(20,283)	(12,016)
Changes in escrow funds payable	20,283	12,016
Proceeds from exercises of stock options and common stock warrant	7,011	1,494
Proceeds from exercise of redeemable convertible preferred stock warrant		260
Proceeds from borrowings on debt	15,000	15,000
Payment of debt issuance costs		(84)
Repayment of debt		(17,000)
Payments of deferred offering costs	(3,999)	(14)
Net cash provided by (used in) financing activities	18,012	(344)
NET INCREASE IN CASH	5,460	11,204
Cash, beginning of year	21,595	27,326
Cash, end of period	27,055	38,530
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes	7	12
Cash paid for interest	1,573	663
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Property and equipment purchased but not yet paid	166	77
Reclassification of redeemable convertible preferred stock warrant liability to redeemable convertible preferred stock		$ 144
Unpaid deferred offering costs	$ 1,583

Organization and Description of Business	9 Months Ended
Organization and Description of Business	Sep. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Description of Business	Note 1—Organization and Description of Business Upwork Inc. (the “Company” or “Upwork”) operates an online marketplace that enables businesses (“clients”) to find and work with highly-skilled independent professionals (“freelancers,” and, together with clients, “users”). The Company was originally incorporated in the state of Delaware in December 2013 prior to and in connection with the combination of Elance, Inc. and oDesk Corporation (the “Elance-oDesk Combination”). The Company changed its name to Elance-oDesk, Inc. (“Elance-oDesk”) shortly before the Elance-oDesk Combination in March 2014, and later to Upwork Inc. in May 2015. In 2015, the Company relaunched as Upwork and commenced consolidation of its two operating platforms. In 2016, following completion of the platform consolidation, the Company began operating under a single platform. The Company is headquartered in Mountain View, California. The terms “Upwork” and the “Company” in these notes to the condensed consolidated financial statements refer to Upwork and its wholly-owned subsidiaries taken as a whole.

Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Note 2—Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) and applicable rules and regulations of the SEC regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in our final prospectus filed with the SEC on October 3, 2018 (the “Prospectus”) pursuant to Rule 424(b) under the Securities Act of 1933, as amended (the “Securities Act”). The condensed consolidated balance sheet as of December 31, 2017 included herein was derived from the audited financial statements as of that date, but does not include all disclosures including notes required by U.S. GAAP. The condensed consolidated financial statements include the accounts of Upwork Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated. The accompanying condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2018. Initial Public Offering In October 2018, the Company completed its initial public offering (the “IPO”), in which the Company issued and sold an aggregate of 7,840,908 shares of the Company’s common stock, including 1,022,727 shares pursuant to the exercise of the underwriters’ option to purchase additional shares, and selling stockholders sold 6,507,288 shares of the Company’s common stock, including 848,776 shares pursuant to the exercise of the underwriters’ option to purchase additional shares. The shares were sold at the IPO price of $15.00 per share. The Company received aggregate net proceeds of $109.4 million from the IPO after deducting underwriting discounts and commissions. Because the IPO closed in October 2018, the condensed consolidated financial statements as of September 30, 2018 and for the periods then ended, do not reflect the impact of the IPO. See Note 14—Subsequent Events. Income Taxes The Company recorded immaterial provision for income taxes in all periods presented. The Company continues to maintain a full valuation allowance against its net deferred tax assets. As of September 30, 2018, the Company had unrecognized tax benefits of $10.8 million, none of which would currently affect the Company’s effective tax rate if recognized due to the Company’s net deferred tax assets being fully offset by a valuation allowance. The Company does not anticipate that the amount of unrecognized tax benefits relating to tax positions existing at September 30, 2018 will significantly increase or decrease within the next 12 months. There was no interest expense or penalties related to unrecognized tax benefits recorded through September 30, 2018. A number of years may elapse before an uncertain tax position is audited and finally resolved. While it is often difficult to predict the final outcome or the timing of resolution of any particular uncertain tax position, the Company believes that its reserves for income taxes reflect the most likely outcome. The Company adjusts these reserves, as well as the related interest, in light of changing facts and circumstances. Settlement of any particular position would not require the use of cash. On December 22, 2017, the U.S. government enacted comprehensive tax legislation referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act significantly revises the future ongoing U.S. corporate income tax by, among other things, lowering the U.S. corporate income tax rates and implementing a territorial tax system. The corporate tax rate was reduced from 35% to 21% for tax years beginning after December 31, 2017 and certain provisions exist on which to allow accelerated expensing of equipment for a portion of 2017 and for future years. These changes primarily impacted the value of the Company’s deferred tax assets with a corresponding offset to valuation allowance, both of which were recognized in the year ended December 31, 2017. The Tax Act also limits the amount of net operating losses that can be used to reduce taxable income to 80% for net operating losses generated for periods beginning after December 31, 2017. Existing net operating losses, arising in years on or before December 31, 2017 are not affected by the Tax Act. The Company expects to finalize the assessment of the accounting for the income tax effects of the Tax Act, as it relates to its current structure, including provisions that are effective for tax years beginning in 2018 during the three months ended December 31, 2018. The Company’s preliminary assessment is subject to revisions to any additional guidance issued by the U.S. Treasury Department, the Internal Revenue Service, the Financial Accounting Standards Board (“FASB”), and other standard-setting and regulatory bodies. Adjustments may materially impact the Company’s provision for income taxes and the assessment of the accounting for the tax effects of the Tax Act will not extend beyond one year from the enactment date. Significant Accounting Policies There have been no changes to the Company’s significant accounting policies that are described in the Prospectus. Use of Estimates The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates, judgments, and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the periods presented. Such estimates include, but are not limited to, the useful lives of assets; assessment of the recoverability of long-lived assets; goodwill impairment; allowance for doubtful accounts; liabilities relating to transaction losses; the valuation of warrants; stock-based compensation; and accounting for income taxes. Management bases its estimates on historical experience and on various other assumptions that management believes to be reasonable under the circumstances. The Company evaluates its estimates, assumptions, and judgments on an ongoing basis using historical experience and other factors and revises them when facts and circumstances dictate. Actual results could materially differ from these estimates. Recent Accounting Pronouncements Not Yet Adopted As an “emerging growth company,” the Jumpstart Our Business Startups Act (“JOBS Act”) allows the Company to delay adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. The Company has elected to use this extended transition period under the JOBS Act. The adoption dates discussed below reflect this election. In May 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (“ASC 606”). ASC 606 supersedes the revenue recognition requirements in ASC 605, and requires the recognition of revenue when promised goods or services are transferred to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASC 606 also includes Subtopic 340-40, Other Assets and Deferred Costs—Contracts with Customers (“Subtopic 340-40” and together with ASC 606, the “new revenue standard”), which requires the deferral of incremental costs of obtaining a contract with a customer. In August 2015, the FASB deferred the effective date for annual reporting periods beginning after December 15, 2017. In 2016, the FASB issued amendments on this guidance with the same effective date and transition guidance. The new revenue standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. The Company is required to adopt the new revenue standard for the year ending December 31, 2019. Interim reporting under ASC 606 will not be required until 2020. To date, the Company has established an implementation team and is in the process of evaluating the impact of the new revenue standard on its accounting policies, processes, and system requirements. Furthermore, the Company has made and will continue to make investments in systems to enable timely and accurate reporting under the new revenue standard. The Company is continuing to evaluate adoption methods and the potential impact that the implementation of this standard will have on its condensed consolidated financial statements, including the identification of performance obligations, evaluation of material right considerations, principal agent considerations, the timing of revenue recognition, and related disclosures, but has not yet determined whether the effects of adoption will be material to its condensed consolidated financial statements. In February 2016, FASB issued ASU No. 2016-02, Leases (Topic 842), related to how an entity should recognize lease assets and lease liabilities. The guidance specifies that an entity that is a lessee under lease agreements should recognize lease assets and lease liabilities for those leases classified as operating leases under previous FASB guidance. Accounting for leases by lessors is largely unchanged under the new guidance. In 2018, the FASB also approved an amendment that would permit the option to adopt the new standard prospectively as of the effective date, without adjusting comparative periods presented. The new standard becomes effective for the Company for the year ending on December 31, 2020. The Company is currently evaluating the impact of adopting this new guidance on its condensed consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payment, to clarify how certain cash receipts and payments are presented and classified in the statement of cash flows. The new guidance becomes effective for the Company for the year ending December 31, 2019, although early adoption is permitted. The Company is currently evaluating the impact of adopting this new guidance on its condensed consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, that will require that the amounts generally described as restricted cash and restricted cash equivalents would be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period amounts shown on the statement of cash flows. The new guidance also requires certain disclosures to supplement the statement of cash flows. The guidance becomes effective for the Company for the year ending on December 31, 2019, although early adoption is permitted. The Company is currently evaluating the impact of adopting this new guidance on its condensed consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Others (Topic 350): Simplifying the Test for Goodwill Impairment. ASU No. 2017-04 eliminates Step 2 from the goodwill impairment test, which measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. Under ASU No. 2017-04, an entity should perform its annual or interim goodwill impairment test by comparing the fair value of the reporting unit with its carrying amount and recognize an impairment loss for the amount by which the carrying amount exceeds the reporting unit’s fair value, with the loss not exceeding the total amount of goodwill allocated to that reporting unit. The guidance becomes effective for the Company on a prospective basis for its annual or any interim goodwill impairment tests during the year ending on December 31, 2021, although early adoption is permitted. The Company is currently evaluating the impact of adopting this new guidance on its condensed consolidated financial statements. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which expands and refines hedge accounting for both financial and non-financial risk components, aligns the recognition and presentation of the effects of hedging instruments and hedge items in the financial statements, and includes certain targeted improvements to ease the application of current guidance related to the assessment of hedge effectiveness. ASU No. 2017-12 is effective for the Company for fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company has not yet evaluated the impact of this standard on its financial statements and related disclosures. In June 2018, the FASB issued ASU No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. ASU No. 2018-07 expands the scope of Topic 718, Compensation-Stock Compensation to include share-based payment transactions for acquiring goods and services from non-employees. These awards are measured at the grant-date fair value of the equity instruments that an entity is obligated to issue when the good has been delivered or the service has been rendered and any other conditions necessary to earn the right to benefit from the instruments have been satisfied. The guidance is effective for the Company for the fiscal year ending on December 31, 2020, although early adoption is permitted but not earlier than the Company’s adoption of ASC 606, and the guidance requires a modified retrospective application to awards that have not been settled as of the adoption date. The Company has not yet evaluated the impact of this standard on its financial statements and related disclosures. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement, which modifies the disclosure requirements on fair value measurements. ASU No. 2018-13 is effective for the Company for the fiscal year ending on December 31, 2021, although early adoption is permitted. The Company has not yet evaluated the impact of this standard on its financial statements and related disclosures. In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. ASU 2018-15 aligns the requirements for capitalizing implementation costs in a cloud computing arrangement service contract with the requirements for capitalizing implementation costs incurred for an internal-use software license. ASU No. 2018-15 is effective for the Company for the fiscal year ending on December 31, 2021, although early adoption is permitted. The Company has not yet evaluated the impact of this standard on its financial statements and related disclosures. Recently Adopted Accounting Pronouncement In March 2016, the FASB issued ASU 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The Company adopted this standard as of January 1, 2018. ASU 2016-09 eliminates the requirement to delay the recognition of excess tax benefits until they reduce current taxes payable. Under this standard, previously unrecognized excess tax benefits shall be recognized on a modified retrospective basis. ASU No. 2016-09 also requires excess tax benefits and deficiencies to be recognized prospectively in the Company’s provision for income taxes rather than additional paid-in capital. Additionally, the Company elected to account for forfeitures as they occur rather than estimate expected forfeiture using a modified retrospective transition method. Finally, ASU No. 2016-09 requires excess tax benefits to be presented as a component of operating cash flows rather than financing cash flows. The Company elected to adopt this requirement prospectively and accordingly, prior periods have not been adjusted. The adoption of this standard was immaterial to the condensed consolidated financial statements as of and for the three and nine months ended September 30, 2018. In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting, which provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in the ASU. The Company adopted this standard as of January 1, 2018. The adoption of this standard had no impact on the Company’s condensed consolidated financial statements as of and for the three and nine months ended September 30, 2018.

Fair Value Measurements

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 3—Fair Value Measurements

The Company measures its redeemable convertible preferred stock warrant liability at fair value on a recurring basis. The Company defines fair value as the exchange price that would be received from sale of an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The authoritative guidance describes three levels of inputs that may be used to measure fair value:

•

Level I—Observable inputs that reflect unadjusted quoted prices for identical assets or liabilities in active markets;

•

Level II—Observable inputs other than Level I prices, such as unadjusted quoted prices for similar assets or liabilities in active markets, unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and

•

Level III—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. These inputs are based on the Company’s own assumptions used to measure assets and liabilities at fair value and require significant management judgment or estimation.

The categorization of a financial instrument within the fair value hierarchy is based upon the lowest level of input that is significant to its fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the assets or liability.

The Company’s financial instruments that are carried at fair value consist of Level III liabilities. The Company’s redeemable convertible preferred stock warrant liability is classified within Level III because the warrants are valued using a Black-Scholes valuation model, for which some inputs are unobservable in the market. The valuation methodology and underlying assumptions are discussed further in Note 8 – Preferred and Common Stock Warrants.

The following tables set forth the fair value of the Company’s financial liabilities measured at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands):

	September 30, 2018
	Level I		Level II		Level III		Total
Financial Liabilities:
Redeemable convertible preferred stock warrant liability	$	—	$	—	$	4,714	$	4,714
Total financial liabilities	$	—	$	—	$	4,714	$	4,714

	December 31, 2017
	Level I		Level II		Level III		Total
Financial Liabilities:
Redeemable convertible preferred stock warrant liability	$	—	$	—	$	1,104	$	1,104
Total financial liabilities	$	—	$	—	$	1,104	$	1,104

The increase in Level III from December 31, 2017 to September 30, 2018 was due solely to the remeasurement of the Company’s redeemable convertible preferred stock warrant liability, which was $3.6 million for the nine months ended September 30, 2018, and is included in other expense, net in the Company’s condensed consolidated statements of operations.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Balance Sheet Components

9 Months Ended

Sep. 30, 2018

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

Note 4—Balance Sheet Components

Property and Equipment, Net

Property and equipment, net consisted of the following (in thousands):

	September 30, 2018			December 31, 2017
Computer equipment and software	$	5,250		$	5,385
Internal-use software and platform development costs		4,988			2,318
Leasehold improvements		2,973			2,189
Office furniture and fixtures		1,952			1,550
Total property and equipment		15,163			11,442
Less: Accumulated depreciation		(8,903	)		(7,928	)
Property and equipment, net	$	6,260		$	3,514

Depreciation expense related to property and equipment was $0.6 million and $0.4 million for the three months ended September 30, 2018 and 2017, respectively.

Depreciation expense related to property and equipment was $1.5 million and $1.1 million for the nine months ended September 30, 2018 and 2017, respectively.

The Company capitalized $0.8 million and $0.2 million of internal-use software and platform development costs during the three months ended September 30, 2018 and 2017, respectively, and $2.7 million and $0.4 million during the nine months ended September 30, 2018 and 2017, respectively. There was no amortization expense during the three and nine months ended September 30, 2017 related to the internal-use software and platform development costs. During the three months ended September 30, 2018, the Company placed into service approximately $0.6 million of the underlying assets. Amortization expense related to the internal-use software and platform development costs for the three and nine months ended September 30, 2018 was immaterial.

Intangible Assets, Net

All of the Company’s identifiable intangible assets were acquired in March 2014 from the Elance-oDesk Combination. Intangible assets, net consisted of the following (in thousands):

	September 30, 2018
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade names	$	2,293	$	2,293	$	—
User relationships		18,678		12,007		6,671
Developed technology		10,356		10,356		—
Domain names		529		529		—
Total	$	31,856	$	25,185	$	6,671

	December 31, 2017
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade names	$	2,293	$	2,293	$	—
User relationships		18,678		10,006		8,672
Developed technology		10,356		10,356		—
Domain names		529		529		—
Total	$	31,856	$	23,184	$	8,672

Total amortization expense of intangible assets was $0.7 million for the three months ended September 30, 2018 and 2017 and $2.0 million and $2.1 million for the nine months ended September 30, 2018 and 2017, respectively. Amortization expense was included in general and administrative expenses. As of September 30, 2018, the remaining useful life for user relationships was 2.5 years. As of December 31, 2017, the remaining useful life for user relationships was 3.3 years.

The estimated future amortization expense for the acquired intangible assets is as follows (in thousands):

	September 30, 2018
Remainder of 2018	$	670
2019		2,668
2020		2,668
2021		665
Total	$	6,671

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):

	September 30, 2018		December 31, 2017
Accrued compensation and related benefits	$	7,239	$	8,399
Accrued freelancer costs		615		134
Accrued indirect taxes		1,634		1,861
Accrued vendor expenses		5,696		4,198
Accrued payment processing fees		683		593
Other		1,044		845
Total accrued expenses and other current liabilities	$	16,911	$	16,030

Commitments and Contingencies

9 Months Ended

Sep. 30, 2018

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 5—Commitments and Contingencies

Operating Leases

The Company leases office space under four non-cancelable operating lease agreements, which expire from 2019 through 2024. The terms of the office leases contain rent escalation clauses, rent holidays, or tenant improvement allowances. The Company recognizes rent expense on a straight-line basis over the non-cancelable lease term and records the difference between cash payments and the recognition of rent expense as a deferred rent liability. Where leases contain escalation clauses, rent holidays, or tenant improvement allowances, the Company applies them in the determination of straight-line rent expense over the lease term. In September 2015, the Company entered into an agreement to sublease a portion of its office space in San Francisco and recognized sublease income of $0.3 million and $0.8 million during the three and nine months ended September 30, 2017. The sublease agreement was terminated in November 2017.

In September 2018, the Company entered into an agreement to extend its non-cancellable operating lease for its San Francisco office through 2024. From September 1, 2019 through August 31, 2024, total minimum lease payments under the lease agreement are $15.7 million, with lease payments ranging from $1.0 million to $2.2 million per year from 2019 to 2024.

Also in September 2018, the Company entered into an agreement for a non-cancellable operating lease for new office space in Chicago through 2024. From June 1, 2019 through October 31, 2024, total minimum lease payments under the lease agreement are $5.1 million, with lease payments ranging from $0.5 million to $1.0 million per year from 2019 to 2024.

Future aggregate minimum lease payments under the non-cancelable operating leases were as follows (in thousands):

	September 30, 2018
Remainder of 2018	$	1,036
2019		3,569
2020		4,223
2021		3,981
2022		4,095
2023		4,214
2024		3,039
Total minimum lease payments	$	24,157

Rent expense was $1.1 million and $0.9 million for the three months ended September 30, 2018 and 2017, respectively. Rent expense was $3.0 million and $2.8 million for the nine months ended September 30, 2018 and 2017, respectively.

Letters of Credit

As of September 30, 2018 and December 31, 2017, in conjunction with the operating lease agreements, the Company had two irrevocable letters of credit outstanding in the aggregate amount of $0.6 million and $0.8 million, respectively. The letters of credit are collateralized by restricted cash in the same amount and expire in 2019. No amounts have been drawn against these letters of credit as of September 30, 2018 and December 31, 2017.

Contingencies

The Company accrues contingent liabilities when it is probable that future expenditures will be made and such expenditures can be reasonably estimated. From time to time in the normal course of business, various claims and litigation have been asserted or commenced. Due to uncertainties inherent in litigation and other claims the Company can give no assurance that it will prevail in any such matters, which could subject the Company to significant liability or damages. Any claims or litigation could have an adverse effect on the Company’s business, financial position, results of operations or cash flows in or following the period that claims or litigation are resolved.

As of September 30, 2018 and December 31, 2017, the Company was not a party to any material legal proceedings or claims, nor is the Company aware of any pending or threatened litigation or claims that could reasonably be expected to have a material adverse effect on its business, operating results, cash flows, or financial condition. Accordingly, the Company has determined that the existence of a material loss as of this date is neither probable nor reasonably possible.

Indemnification

The Company has indemnification agreements with its officers, directors, and certain key employees to indemnify them while they are serving in good faith in their respective positions. In the ordinary course of business, the Company enters into contractual arrangements under which it agrees to provide indemnification of varying scope and terms to vendors and other parties, including, but not limited to, losses arising out of the Company’s breach of such agreements. In addition, subject to the terms of the applicable agreement, as part of the Company’s Upwork Enterprise offering, the Company indemnifies clients that subscribe to worker classification services for losses arising from worker misclassification and intellectual property claims made by third parties relating to the use of the Company’s platform. It is not possible to determine the maximum potential loss under these indemnification provisions due to the Company’s limited history of prior indemnification claims and the facts and circumstances involved in each particular provision.

Debt

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Debt

Note 6—Debt

The following table presents the carrying value of the Company’s debt (in thousands):

	September 30, 2018			December 31, 2017
First term loan—18 months of interest-only payments ending in March 2019 followed by 36 equal monthly installments of principal plus interest, maturing March 2022; interest at Prime plus 0.25% per annum	$	15,000		$	15,000
Second term loan—11 months of interest-only payments ending in October 2018 followed by 47 equal monthly installments of principal plus interest, maturing September 2022. As of September 30, 2018, the Company achieved trailing six-month EBITDA of at least $1.0 million; as a result, the interest-only repayment period extended to March 2019, followed by 42 equal monthly installments of principal plus interest; bears interest at Prime plus 5.25% per annum		9,000			9,000
Line of credit—interest at Prime with accrued interest due monthly; matures September 2020		25,000			10,000
Total debt		49,000			34,000
Less: Unamortized debt discount issuance costs		(102	)		(167	)
Balance		48,898			33,833
Debt, current		(29,594	)		(10,342	)
Debt, noncurrent	$	19,304		$	23,491
Weighted-average interest rate		6.08	%		5.93	%

In September 2017, the Company entered into a Loan and Security Agreement (the “Loan Agreement”), which was subsequently amended in November 2017 and September 2018. The Loan Agreement consisted initially of a term loan (the “First Term Loan”) of $15.0 million and a $15.0 million revolving line of credit based on eligible trade and client accounts receivable, for an aggregate facility amount of $30.0 million. However, upon the Company achieving adjusted net revenue of at least $49.0 million in a trailing three-month period on or before June 30, 2018, the revolving line of credit increased to $25.0 million with a corresponding increase to the aggregate facility amount to $40.0 million. The Loan Agreement was amended in November 2017 to include a second term loan of $9.0 million (the “Second Term Loan,” and together with the First Term Loan, the “Term Loans”), which, in turn, increased the aggregate maximum amount of the facility of up to $49.0 million. The Company incurred debt issuance costs of $0.2 million, which was primarily classified as a deduction to the long-term portion of the Term Loan. In November 2017, the Company drew revolving loan borrowings of $10.0 million and Term Loan borrowings of $9.0 million. The Company has granted its lender first-priority liens against substantially all of its assets, as collateral, excluding the Company’s intellectual property (but including proceeds therefrom) and the funds and assets held by the Company’s subsidiary, Upwork Escrow Inc. The Company has also agreed to a negative pledge on its intellectual property. The Loan Agreement is also subject to the Company maintaining an adjusted quick ratio of 1.30 and achieving minimum EBITDA levels over trailing periods ranging from three to twelve months. The Loan Agreement also includes a restrictive covenant on dividend payments other than dividends paid solely in common stock.

In September 2018, the Company entered into a second amendment (the “Second Amendment”) to the Loan Agreement which expanded the types of eligible trade and client accounts receivable considered for the determination of the borrowing base of the revolving line of credit. The Second Amendment also provided for a reduction in the interest rate for the Second Term Loan, from prime plus 5.25% to prime plus 0.25%, from and after the occurrence of an initial public offering by the Company with net proceeds of more than $50.0 million. Because the IPO occurred in October 2018, the change in interest rate had no effect on the Company’s condensed consolidated financial statements as of and for the three and nine months ended September 30, 2018. To the extent the Company has not yet collected funds for hourly billings from clients which are in-transit due to timing differences in receipt of cash from clients and payments of cash to freelancers, the Company plans, from time to time, to utilize the revolving line of credit to satisfy escrow funding requirements. In September 2018, the Company drew down $15.0 million under the revolving line of credit for such purpose. In October 2018, the Company repaid a total of $25.0 million of indebtedness owed under the Loan Agreement. See Note 14—Subsequent Events.

The amortization expense related to the debt discount was immaterial for the three and nine months ended September 30, 2018 and 2017. The Company was in compliance with all financial-related covenants under the Loan Agreement as of September 30, 2018 and December 31, 2017.

Redeemable Convertible Preferred Stock

9 Months Ended

Sep. 30, 2018

Temporary Equity Disclosure [Abstract]

Redeemable Convertible Preferred Stock

Note 7—Redeemable Convertible Preferred Stock

Redeemable convertible preferred stock as of September 30, 2018 and December 31, 2017 consisted of the following (in thousands, except share data):

	Shares Authorized		Shares Issued and Outstanding		Net Carrying Value		Aggregate Liquidation Preference
Series A-1		10,141,345		9,142,770	$	72,181	$	91,427
Series A-2		60,000,000		47,124,931		65,853		5
Series B-1		5,854,982		4,866,360		27,628		27,787
Series B-2		145,018		145,018		824		828
Total redeemable convertible preferred stock		76,141,345		61,279,079	$	166,486	$	120,047

Preferred and Common Stock Warrants

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Preferred and Common Stock Warrants

Note 8—Preferred and Common Stock Warrants

Redeemable Convertible Preferred Stock Warrants

As a result of the Elance-oDesk Combination, a redeemable convertible preferred stock warrant that was originally issued by Elance prior to the Elance-oDesk Combination became exercisable to purchase up to 26,000 and 57,181 shares of the Company’s Series A-1 and Series A-2 redeemable convertible preferred stock, respectively, at an exercise price of $3.13 per share. In June 2017, the warrant was exercised in full.

Further, as a result of the Elance-oDesk Combination, another redeemable convertible preferred stock warrant that was originally issued by Elance prior to the Elance-oDesk Combination became exercisable to purchase up to 124,506 and 273,825 shares of the Company’s Series A-1 and Series A-2 redeemable convertible preferred stock, respectively, at an exercise price of $3.13 per share. The warrant was outstanding and exercisable as of September 30, 2018 and December 31, 2017.

The Company estimated the fair value of each redeemable convertible preferred stock warrant using the Black-Scholes valuation model. The redeemable convertible preferred stock liability, included in other noncurrent liabilities, was $4.7 million as of September 30, 2018, and $1.1 million as of December 31, 2017. The following assumptions were used to calculate the fair value of the then-outstanding warrants as of September 30, 2018 and December 31, 2017:

	September 30, 2018		December 31, 2017
Dividend yield	0%		0%
Expected term (in years)		2.00		2.75
Risk-free interest rates	2.8%		1.8%
Expected volatility	36.8%		34.6%

Common Stock Warrant

As a result of the Elance-oDesk Combination, a common stock warrant that was originally issued by oDesk prior to the Elance-oDesk Combination became exercisable to purchase up to 45,286 shares of the Company’s common stock at an exercise price of $0.06 per share. The warrant was outstanding and exercisable as of December 31, 2017 with the fair value of the warrant reflected in additional paid-in capital in the condensed consolidated balance sheets. In May 2018, the Company issued 45,286 shares of common stock upon the exercise of this common stock warrant.

In April 2018, the Company established The Upwork Foundation initiative. The program will include a donor-advised fund created through the Tides Foundation. In May 2018, the Company issued a warrant to purchase 500,000 shares of its common stock at an exercise price of $0.01 per share to the Tides Foundation.

This warrant is exercisable as to 1/10th of the shares on each anniversary of the IPO, with proceeds from the sale of such shares to be donated in accordance with the Company’s directive. The IPO occurred in October 2018; as such, the issuance of this warrant has had no effect on the Company’s condensed consolidated financial statements as of and for the three and nine months ended September 30, 2018.

Common Stock

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Common Stock

Note 9—Common Stock

Holders of common stock are entitled to one vote per share and are entitled to dividends on a pro rata basis with the holders of redeemable convertible preferred stock whenever funds are legally available and when, as, and if declared by the Company’s board of directors, subject to the rights of the holders of the Company’s redeemable convertible preferred stock.

As of September 30, 2018 and December 31, 2017, the Company was authorized to issue 150,000,000 shares of common stock. As of September 30, 2018 and December 31, 2017, the Company had reserved shares of common stock, on an as-converted basis, for future issuance as follows:

	September 30, 2018		December 31, 2017
Options issued and outstanding		24,312,203		23,607,746
Warrant to purchase redeemable convertible preferred stock		398,331		398,331
Warrant to purchase common stock		500,000		45,286
Conversion of redeemable convertible preferred stock		61,279,079		61,279,079
Remaining shares reserved for future issuances under 2014 Plan		197,859		3,962,024
Total		86,687,472		89,292,466

Stock-Based Compensation

9 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

Note 10—Stock-Based Compensation

The following table summarizes activity under the Company’s stock option plans:

	Options Outstanding
	Shares Available for Grant			Number of Shares Underlying Outstanding Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value (in thousands)
Balances at December 31, 2017		3,962,024			23,607,746		$	3.10		7.39	$	22,260
Authorized		100,000			—
Granted		(4,468,523	)		4,468,523			5.88
Exercised		—			(3,159,708	)		2.22
Forfeited and cancelled		604,358			(604,358	)		3.72
Balances at September 30, 2018		197,859			24,312,203		$	3.71		7.36	$	269,431

In July 2018, the Company’s board of directors granted Stephane Kasriel, Chief Executive Officer, an option to purchase 1,860,000 shares of common stock at an exercise price of $6.61 per share, with vesting contingent on continuous service and the achievement of various business milestones, including the completion of the IPO. Because the IPO had not been completed as of September 30, 2018, vesting had not commenced and, as a result, there has been no effect on the Company’s condensed consolidated financial statements as of and for the period ended September 30, 2018. In addition to the IPO milestone, vesting of this award is contingent upon the achievement of certain financial milestones, such as positive EBITDA and GSV growth rates from 2019 through 2023.

Stock-Based Compensation

The following table summarizes the components of stock-based compensation expense recognized in the condensed consolidated statements of operations (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Cost of revenue	$	59	$	48	$	164	$	241
Research and development		623		432		1,711		1,271
Sales and marketing		355		312		1,026		967
General and administrative		949		734		2,766		2,338
Total stock-based compensation	$	1,986	$	1,526	$	5,667	$	4,817

Stock-based compensation expense related to non-employee stock option grants was immaterial for the three and nine months ended September 30, 2018 and 2017. The amount of stock-based compensation capitalized to internal-use software and platform development costs for the three and nine months ended September 30, 2018 and 2017 was immaterial.

Secondary Market Transactions

Certain common stockholders (who were employees or former employees of the Company) sold the Company’s common stock in secondary market transactions to third parties. During the second quarter of 2017, an aggregate of 195,000 shares of common stock were sold for $0.9 million at an average price of $4.50 per share. The incremental value between the sale price and the fair value of the common stock at each date of sale resulted in aggregate stock-based compensation expense of $0.2 million for the nine months ended September 30, 2017. There were no secondary transactions during the three months ended September 30, 2018 and 2017. There was an immaterial secondary market transaction during the nine months ended September 30, 2018.

Net Loss Per Share Attributable to Common Stockholders

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Net Loss Per Share Attributable to Common Stockholders

Note 11—Net Loss per Share Attributable to Common Stockholders

The following table sets forth the computation of the Company’s basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share data):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Numerator:
Net income (loss)	$	(7,346	)	$	(301	)	$	(14,542	)	$	1,068
Less: Undistributed earnings allocable to preferred stockholders		—			—			—			(1,068	)
Net loss attributable to common stockholders	$	(7,346	)	$	(301	)	$	(14,542	)	$	—
Denominator:
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted		36,069,502			33,298,773			35,129,250			32,760,339
Net loss per share attributable to common stockholders, basic and diluted	$	(0.20	)	$	(0.01	)	$	(0.41	)	$	—

The following potentially dilutive shares were excluded from the computation of diluted net loss per share attributable to common stockholders because including them would have been anti-dilutive:

	September 30,
	2018		2017
Options to purchase common stock		24,312,203		22,825,933
Common stock issuable upon conversion of redeemable convertible preferred stock		61,279,079		65,547,568
Common stock issuable upon exercise of common stock warrant		500,000		45,286
Common stock issuable upon exercise and redeemable conversion of preferred stock warrants		398,331		398,331
Total		86,489,613		88,817,118

Segment and Geographical Information

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Segment and Geographical Information

Note 12—Segment and Geographical Information

The Company has determined it operates as one operating and reportable segment for purposes of allocating resources and evaluating financial performance.

The following table sets forth total revenue by type of service (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Marketplace	$	56,766	$	46,186	$	164,180	$	130,124
Managed services		7,347		6,076		21,832		17,669
Total	$	64,113	$	52,262	$	186,012	$	147,793

The Company generates its revenue from freelancers and clients. Marketplace revenue included freelancer service fees of $36.5 million and $31.0 million for the three months ended September 30, 2018 and 2017, respectively, and client payment processing and administrative fees of $9.0 million and $7.3 million for the three months ended September 30, 2018 and 2017, respectively. Marketplace revenue included freelancer service fees of $108.5 million and $88.6 million for the nine months ended September 30, 2018 and 2017, respectively, and client payment processing and administrative fees of $25.8 million and $20.6 million for the nine months ended September 30, 2018 and 2017, respectively.

The following table sets forth total revenue by geographic area based on the billing address of its freelancers and clients (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Freelancers:
United States	$	10,273	$	6,839	$	28,930	$	19,184
India		6,561		5,712		19,134		16,183
Philippines		4,377		3,795		12,535		10,839
Rest of world		20,168		17,519		59,352		50,767
Total freelancers		41,379		33,865		119,951		96,973
Clients:
United States		16,504		14,339		50,153		39,703
Rest of world		6,230		4,058		15,908		11,117
Total clients		22,734		18,397		66,061		50,820
Total	$	64,113	$	52,262	$	186,012	$	147,793

Substantially all of the Company’s long-lived assets were located in the United States as of September 30, 2018 and December 31, 2017.

401(k) Plan	9 Months Ended
401(k) Plan	Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract]
401(k) Plan	Note 13—401(k) Plan The Company offers the Upwork Retirement Savings Plan (“Retirement Plan”), a defined contribution plan that allows employees to contribute a portion of their salary, subject to the annual limits. Under the Retirement Plan, eligible employees may defer a portion of their pretax salaries, but not more than the statutory limits. The Retirement Plan provides for a discretionary employer matching cash contribution. The Company makes matching cash contributions equal to 50% of each dollar a participant contributed, subject to a maximum contribution of $5,000 per year. The Company’s total expense for the matching contributions was $0.3 million and $0.2 million for the three months ended September 30, 2018 and 2017, respectively. The Company’s total expense for the matching contributions was $1.4 million and $1.0 million for the nine months ended September 30, 2018 and 2017, respectively.

Subsequent Events

9 Months Ended

Sep. 30, 2018

Subsequent Events [Abstract]

Subsequent Events

Note 14—Subsequent Events

In August 2018, the Company’s board of directors adopted the 2018 Equity Incentive Plan (the “2018 Plan”) and ceased granting awards under the 2014 Equity Incentive Plan. The 2018 Plan became effective in connection with the IPO. The Company reserved 10,500,000 shares of its common stock for issuance under the 2018 Plan. Any remaining shares available for issuance under the 2014 Equity Incentive Plan on the effective date of the 2018 Plan were added to the shares of common stock reserved for issuance under the 2018 Plan. On October 3, 2018, the Company granted approximately 327,000 restricted stock units (“RSUs”) to certain employees, service providers and members of the Company’s board of directors. Of the total RSUs granted, approximately 55,000 were approved and granted to certain members of the Company’s board of directors and will vest within one year from the date of the grant. The RSUs granted to the Company’s employees will vest over four years from the date of the grant.

In October 2018, prior to the IPO, the Company repaid the $15.0 million of indebtedness owed under its Loan Agreement, which was initially drawn to satisfy its escrow funding requirements as of September 30, 2018. See Note 6—Debt.

The Company completed its IPO in October 2018, in which the Company issued and sold 7,840,908 shares of common stock at a public offering price of $15.00 per share. The following table shows, on a pro forma basis, the effect of the IPO as if the IPO had been completed as of September 30, 2018 (in thousands):

	As of September 30, 2018
Consolidated Balance Sheet Data:	Actual			Pro Forma Adjustments			Pro Forma
Cash	$	27,055		$	99,381		$	126,436
Total current assets		181,452			99,381			280,833
Other assets		6,240			(5,648	)		592
Total assets		318,842			93,733			412,575
Debt, current		29,594			(10,000	)		19,594
Total current liabilities		160,172			(10,000	)		150,172
Other liabilities, noncurrent		6,110			(4,714	)		1,396
Total liabilities		185,586			(14,714	)		170,872
Redeemable convertible preferred stock		166,486			(166,486	)		—
Common stock		4			7			11
Additional paid-in capital		104,900			274,926			379,826
Total stockholders' equity (deficit)		(33,230	)		274,933			241,703
Total liabilities, redeemable convertible preferred stock, and stockholders' equity (deficit)		318,842			93,733			412,575

A description of the pro forma adjustments, as well as their location in the above table, are as follows:

Cash: Received net proceeds of $109.4 million after deducting underwriting discounts and commissions of $8.2 million.

Other assets: Reclassification of $5.6 million deferred offering costs against additional paid-in capital, which is a component of total stockholders’ equity.

Debt, current: Repayment of $10.0 million of indebtedness under the loan agreement from net proceeds.

Other liabilities, noncurrent: Reclassification of $4.7 million related to the redeemable convertible preferred stock liability to additional paid-in capital, a component of total stockholders’ equity.

Redeemable convertible preferred stock: Automatic conversion into 61,279,079 shares of common stock on a one-for-one basis.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) and applicable rules and regulations of the SEC regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in our final prospectus filed with the SEC on October 3, 2018 (the “Prospectus”) pursuant to Rule 424(b) under the Securities Act of 1933, as amended (the “Securities Act”). The condensed consolidated balance sheet as of December 31, 2017 included herein was derived from the audited financial statements as of that date, but does not include all disclosures including notes required by U.S. GAAP. The condensed consolidated financial statements include the accounts of Upwork Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated. The accompanying condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2018.
Initial Public Offering	Initial Public Offering In October 2018, the Company completed its initial public offering (the “IPO”), in which the Company issued and sold an aggregate of 7,840,908 shares of the Company’s common stock, including 1,022,727 shares pursuant to the exercise of the underwriters’ option to purchase additional shares, and selling stockholders sold 6,507,288 shares of the Company’s common stock, including 848,776 shares pursuant to the exercise of the underwriters’ option to purchase additional shares. The shares were sold at the IPO price of $15.00 per share. The Company received aggregate net proceeds of $109.4 million from the IPO after deducting underwriting discounts and commissions. Because the IPO closed in October 2018, the condensed consolidated financial statements as of September 30, 2018 and for the periods then ended, do not reflect the impact of the IPO. See Note 14—Subsequent Events.
Income Taxes	Income Taxes The Company recorded immaterial provision for income taxes in all periods presented. The Company continues to maintain a full valuation allowance against its net deferred tax assets. As of September 30, 2018, the Company had unrecognized tax benefits of $10.8 million, none of which would currently affect the Company’s effective tax rate if recognized due to the Company’s net deferred tax assets being fully offset by a valuation allowance. The Company does not anticipate that the amount of unrecognized tax benefits relating to tax positions existing at September 30, 2018 will significantly increase or decrease within the next 12 months. There was no interest expense or penalties related to unrecognized tax benefits recorded through September 30, 2018. A number of years may elapse before an uncertain tax position is audited and finally resolved. While it is often difficult to predict the final outcome or the timing of resolution of any particular uncertain tax position, the Company believes that its reserves for income taxes reflect the most likely outcome. The Company adjusts these reserves, as well as the related interest, in light of changing facts and circumstances. Settlement of any particular position would not require the use of cash. On December 22, 2017, the U.S. government enacted comprehensive tax legislation referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act significantly revises the future ongoing U.S. corporate income tax by, among other things, lowering the U.S. corporate income tax rates and implementing a territorial tax system. The corporate tax rate was reduced from 35% to 21% for tax years beginning after December 31, 2017 and certain provisions exist on which to allow accelerated expensing of equipment for a portion of 2017 and for future years. These changes primarily impacted the value of the Company’s deferred tax assets with a corresponding offset to valuation allowance, both of which were recognized in the year ended December 31, 2017. The Tax Act also limits the amount of net operating losses that can be used to reduce taxable income to 80% for net operating losses generated for periods beginning after December 31, 2017. Existing net operating losses, arising in years on or before December 31, 2017 are not affected by the Tax Act. The Company expects to finalize the assessment of the accounting for the income tax effects of the Tax Act, as it relates to its current structure, including provisions that are effective for tax years beginning in 2018 during the three months ended December 31, 2018. The Company’s preliminary assessment is subject to revisions to any additional guidance issued by the U.S. Treasury Department, the Internal Revenue Service, the Financial Accounting Standards Board (“FASB”), and other standard-setting and regulatory bodies. Adjustments may materially impact the Company’s provision for income taxes and the assessment of the accounting for the tax effects of the Tax Act will not extend beyond one year from the enactment date.
Significant Accounting Policies	Significant Accounting Policies There have been no changes to the Company’s significant accounting policies that are described in the Prospectus.
Use of Estimates	Use of Estimates The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates, judgments, and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the periods presented. Such estimates include, but are not limited to, the useful lives of assets; assessment of the recoverability of long-lived assets; goodwill impairment; allowance for doubtful accounts; liabilities relating to transaction losses; the valuation of warrants; stock-based compensation; and accounting for income taxes. Management bases its estimates on historical experience and on various other assumptions that management believes to be reasonable under the circumstances. The Company evaluates its estimates, assumptions, and judgments on an ongoing basis using historical experience and other factors and revises them when facts and circumstances dictate. Actual results could materially differ from these estimates.
Recent Accounting Pronouncements Not Yet Adopted	Recent Accounting Pronouncements Not Yet Adopted As an “emerging growth company,” the Jumpstart Our Business Startups Act (“JOBS Act”) allows the Company to delay adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. The Company has elected to use this extended transition period under the JOBS Act. The adoption dates discussed below reflect this election. In May 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (“ASC 606”). ASC 606 supersedes the revenue recognition requirements in ASC 605, and requires the recognition of revenue when promised goods or services are transferred to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASC 606 also includes Subtopic 340-40, Other Assets and Deferred Costs—Contracts with Customers (“Subtopic 340-40” and together with ASC 606, the “new revenue standard”), which requires the deferral of incremental costs of obtaining a contract with a customer. In August 2015, the FASB deferred the effective date for annual reporting periods beginning after December 15, 2017. In 2016, the FASB issued amendments on this guidance with the same effective date and transition guidance. The new revenue standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. The Company is required to adopt the new revenue standard for the year ending December 31, 2019. Interim reporting under ASC 606 will not be required until 2020. To date, the Company has established an implementation team and is in the process of evaluating the impact of the new revenue standard on its accounting policies, processes, and system requirements. Furthermore, the Company has made and will continue to make investments in systems to enable timely and accurate reporting under the new revenue standard. The Company is continuing to evaluate adoption methods and the potential impact that the implementation of this standard will have on its condensed consolidated financial statements, including the identification of performance obligations, evaluation of material right considerations, principal agent considerations, the timing of revenue recognition, and related disclosures, but has not yet determined whether the effects of adoption will be material to its condensed consolidated financial statements. In February 2016, FASB issued ASU No. 2016-02, Leases (Topic 842), related to how an entity should recognize lease assets and lease liabilities. The guidance specifies that an entity that is a lessee under lease agreements should recognize lease assets and lease liabilities for those leases classified as operating leases under previous FASB guidance. Accounting for leases by lessors is largely unchanged under the new guidance. In 2018, the FASB also approved an amendment that would permit the option to adopt the new standard prospectively as of the effective date, without adjusting comparative periods presented. The new standard becomes effective for the Company for the year ending on December 31, 2020. The Company is currently evaluating the impact of adopting this new guidance on its condensed consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payment, to clarify how certain cash receipts and payments are presented and classified in the statement of cash flows. The new guidance becomes effective for the Company for the year ending December 31, 2019, although early adoption is permitted. The Company is currently evaluating the impact of adopting this new guidance on its condensed consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, that will require that the amounts generally described as restricted cash and restricted cash equivalents would be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period amounts shown on the statement of cash flows. The new guidance also requires certain disclosures to supplement the statement of cash flows. The guidance becomes effective for the Company for the year ending on December 31, 2019, although early adoption is permitted. The Company is currently evaluating the impact of adopting this new guidance on its condensed consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Others (Topic 350): Simplifying the Test for Goodwill Impairment. ASU No. 2017-04 eliminates Step 2 from the goodwill impairment test, which measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. Under ASU No. 2017-04, an entity should perform its annual or interim goodwill impairment test by comparing the fair value of the reporting unit with its carrying amount and recognize an impairment loss for the amount by which the carrying amount exceeds the reporting unit’s fair value, with the loss not exceeding the total amount of goodwill allocated to that reporting unit. The guidance becomes effective for the Company on a prospective basis for its annual or any interim goodwill impairment tests during the year ending on December 31, 2021, although early adoption is permitted. The Company is currently evaluating the impact of adopting this new guidance on its condensed consolidated financial statements. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which expands and refines hedge accounting for both financial and non-financial risk components, aligns the recognition and presentation of the effects of hedging instruments and hedge items in the financial statements, and includes certain targeted improvements to ease the application of current guidance related to the assessment of hedge effectiveness. ASU No. 2017-12 is effective for the Company for fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company has not yet evaluated the impact of this standard on its financial statements and related disclosures. In June 2018, the FASB issued ASU No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. ASU No. 2018-07 expands the scope of Topic 718, Compensation-Stock Compensation to include share-based payment transactions for acquiring goods and services from non-employees. These awards are measured at the grant-date fair value of the equity instruments that an entity is obligated to issue when the good has been delivered or the service has been rendered and any other conditions necessary to earn the right to benefit from the instruments have been satisfied. The guidance is effective for the Company for the fiscal year ending on December 31, 2020, although early adoption is permitted but not earlier than the Company’s adoption of ASC 606, and the guidance requires a modified retrospective application to awards that have not been settled as of the adoption date. The Company has not yet evaluated the impact of this standard on its financial statements and related disclosures. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement, which modifies the disclosure requirements on fair value measurements. ASU No. 2018-13 is effective for the Company for the fiscal year ending on December 31, 2021, although early adoption is permitted. The Company has not yet evaluated the impact of this standard on its financial statements and related disclosures. In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. ASU 2018-15 aligns the requirements for capitalizing implementation costs in a cloud computing arrangement service contract with the requirements for capitalizing implementation costs incurred for an internal-use software license. ASU No. 2018-15 is effective for the Company for the fiscal year ending on December 31, 2021, although early adoption is permitted. The Company has not yet evaluated the impact of this standard on its financial statements and related disclosures.
Recently Adopted Accounting Pronouncement	Recently Adopted Accounting Pronouncement In March 2016, the FASB issued ASU 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The Company adopted this standard as of January 1, 2018. ASU 2016-09 eliminates the requirement to delay the recognition of excess tax benefits until they reduce current taxes payable. Under this standard, previously unrecognized excess tax benefits shall be recognized on a modified retrospective basis. ASU No. 2016-09 also requires excess tax benefits and deficiencies to be recognized prospectively in the Company’s provision for income taxes rather than additional paid-in capital. Additionally, the Company elected to account for forfeitures as they occur rather than estimate expected forfeiture using a modified retrospective transition method. Finally, ASU No. 2016-09 requires excess tax benefits to be presented as a component of operating cash flows rather than financing cash flows. The Company elected to adopt this requirement prospectively and accordingly, prior periods have not been adjusted. The adoption of this standard was immaterial to the condensed consolidated financial statements as of and for the three and nine months ended September 30, 2018. In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting, which provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in the ASU. The Company adopted this standard as of January 1, 2018. The adoption of this standard had no impact on the Company’s condensed consolidated financial statements as of and for the three and nine months ended September 30, 2018.

- Definition

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

+ References + Details

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Financial Liabilities Measured at Fair Value on a Recurring Basis

The following tables set forth the fair value of the Company’s financial liabilities measured at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands):

	September 30, 2018
	Level I		Level II		Level III		Total
Financial Liabilities:
Redeemable convertible preferred stock warrant liability	$	—	$	—	$	4,714	$	4,714
Total financial liabilities	$	—	$	—	$	4,714	$	4,714

	December 31, 2017
	Level I		Level II		Level III		Total
Financial Liabilities:
Redeemable convertible preferred stock warrant liability	$	—	$	—	$	1,104	$	1,104
Total financial liabilities	$	—	$	—	$	1,104	$	1,104

Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2018

Balance Sheet Related Disclosures [Abstract]

Property and Equipment, Net

Property and equipment, net consisted of the following (in thousands):

	September 30, 2018			December 31, 2017
Computer equipment and software	$	5,250		$	5,385
Internal-use software and platform development costs		4,988			2,318
Leasehold improvements		2,973			2,189
Office furniture and fixtures		1,952			1,550
Total property and equipment		15,163			11,442
Less: Accumulated depreciation		(8,903	)		(7,928	)
Property and equipment, net	$	6,260		$	3,514

Intangible Assets, Net

All of the Company’s identifiable intangible assets were acquired in March 2014 from the Elance-oDesk Combination. Intangible assets, net consisted of the following (in thousands):

	September 30, 2018
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade names	$	2,293	$	2,293	$	—
User relationships		18,678		12,007		6,671
Developed technology		10,356		10,356		—
Domain names		529		529		—
Total	$	31,856	$	25,185	$	6,671

	December 31, 2017
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade names	$	2,293	$	2,293	$	—
User relationships		18,678		10,006		8,672
Developed technology		10,356		10,356		—
Domain names		529		529		—
Total	$	31,856	$	23,184	$	8,672

Estimated Future Amortization Expense for Acquired Intangible Assets

The estimated future amortization expense for the acquired intangible assets is as follows (in thousands):

	September 30, 2018
Remainder of 2018	$	670
2019		2,668
2020		2,668
2021		665
Total	$	6,671

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):

	September 30, 2018		December 31, 2017
Accrued compensation and related benefits	$	7,239	$	8,399
Accrued freelancer costs		615		134
Accrued indirect taxes		1,634		1,861
Accrued vendor expenses		5,696		4,198
Accrued payment processing fees		683		593
Other		1,044		845
Total accrued expenses and other current liabilities	$	16,911	$	16,030

Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2018

Commitments And Contingencies Disclosure [Abstract]

Schedule of Future Aggregate Minimum Lease Payments Under Non-Cancelable Operating Leases

Future aggregate minimum lease payments under the non-cancelable operating leases were as follows (in thousands):

	September 30, 2018
Remainder of 2018	$	1,036
2019		3,569
2020		4,223
2021		3,981
2022		4,095
2023		4,214
2024		3,039
Total minimum lease payments	$	24,157

Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Summary of Carrying Value of Debt

The following table presents the carrying value of the Company’s debt (in thousands):

	September 30, 2018			December 31, 2017
First term loan—18 months of interest-only payments ending in March 2019 followed by 36 equal monthly installments of principal plus interest, maturing March 2022; interest at Prime plus 0.25% per annum	$	15,000		$	15,000
Second term loan—11 months of interest-only payments ending in October 2018 followed by 47 equal monthly installments of principal plus interest, maturing September 2022. As of September 30, 2018, the Company achieved trailing six-month EBITDA of at least $1.0 million; as a result, the interest-only repayment period extended to March 2019, followed by 42 equal monthly installments of principal plus interest; bears interest at Prime plus 5.25% per annum		9,000			9,000
Line of credit—interest at Prime with accrued interest due monthly; matures September 2020		25,000			10,000
Total debt		49,000			34,000
Less: Unamortized debt discount issuance costs		(102	)		(167	)
Balance		48,898			33,833
Debt, current		(29,594	)		(10,342	)
Debt, noncurrent	$	19,304		$	23,491
Weighted-average interest rate		6.08	%		5.93	%

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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+ Details

Redeemable Convertible Preferred Stock (Tables)

9 Months Ended

Sep. 30, 2018

Temporary Equity Disclosure [Abstract]

Schedule Of Redeemable Convertible Preferred Stock

Redeemable convertible preferred stock as of September 30, 2018 and December 31, 2017 consisted of the following (in thousands, except share data):

	Shares Authorized		Shares Issued and Outstanding		Net Carrying Value		Aggregate Liquidation Preference
Series A-1		10,141,345		9,142,770	$	72,181	$	91,427
Series A-2		60,000,000		47,124,931		65,853		5
Series B-1		5,854,982		4,866,360		27,628		27,787
Series B-2		145,018		145,018		824		828
Total redeemable convertible preferred stock		76,141,345		61,279,079	$	166,486	$	120,047

Preferred and Common Stock Warrants (Tables)

9 Months Ended

Sep. 30, 2018

Redeemable Convertible Preferred Stock Warrants

Assumptions Used to Calculate Fair Value of Outstanding Warrants

The following assumptions were used to calculate the fair value of the then-outstanding warrants as of September 30, 2018 and December 31, 2017:

	September 30, 2018		December 31, 2017
Dividend yield	0%		0%
Expected term (in years)		2.00		2.75
Risk-free interest rates	2.8%		1.8%
Expected volatility	36.8%		34.6%

Common Stock (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Summary of Common Stock Shares Reserved for Future Issuance

As of September 30, 2018 and December 31, 2017, the Company had reserved shares of common stock, on an as-converted basis, for future issuance as follows

	September 30, 2018		December 31, 2017
Options issued and outstanding		24,312,203		23,607,746
Warrant to purchase redeemable convertible preferred stock		398,331		398,331
Warrant to purchase common stock		500,000		45,286
Conversion of redeemable convertible preferred stock		61,279,079		61,279,079
Remaining shares reserved for future issuances under 2014 Plan		197,859		3,962,024
Total		86,687,472		89,292,466

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

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+ Details

Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Activity under Stock Option Plans

The following table summarizes activity under the Company’s stock option plans:

	Options Outstanding
	Shares Available for Grant			Number of Shares Underlying Outstanding Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value (in thousands)
Balances at December 31, 2017		3,962,024			23,607,746		$	3.10		7.39	$	22,260
Authorized		100,000			—
Granted		(4,468,523	)		4,468,523			5.88
Exercised		—			(3,159,708	)		2.22
Forfeited and cancelled		604,358			(604,358	)		3.72
Balances at September 30, 2018		197,859			24,312,203		$	3.71		7.36	$	269,431

Summary of Components of Stock-Based Compensation Expense Recognized

The following table summarizes the components of stock-based compensation expense recognized in the condensed consolidated statements of operations (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Cost of revenue	$	59	$	48	$	164	$	241
Research and development		623		432		1,711		1,271
Sales and marketing		355		312		1,026		967
General and administrative		949		734		2,766		2,338
Total stock-based compensation	$	1,986	$	1,526	$	5,667	$	4,817

Net Loss Per Share Attributable to Common Stockholders (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders

The following table sets forth the computation of the Company’s basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share data):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Numerator:
Net income (loss)	$	(7,346	)	$	(301	)	$	(14,542	)	$	1,068
Less: Undistributed earnings allocable to preferred stockholders		—			—			—			(1,068	)
Net loss attributable to common stockholders	$	(7,346	)	$	(301	)	$	(14,542	)	$	—
Denominator:
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted		36,069,502			33,298,773			35,129,250			32,760,339
Net loss per share attributable to common stockholders, basic and diluted	$	(0.20	)	$	(0.01	)	$	(0.41	)	$	—

Schedule of Potentially Dilutive Shares Excluded from Computation of Diluted Net Loss Per Share Attributable to Common Stockholders

The following potentially dilutive shares were excluded from the computation of diluted net loss per share attributable to common stockholders because including them would have been anti-dilutive:

	September 30,
	2018		2017
Options to purchase common stock		24,312,203		22,825,933
Common stock issuable upon conversion of redeemable convertible preferred stock		61,279,079		65,547,568
Common stock issuable upon exercise of common stock warrant		500,000		45,286
Common stock issuable upon exercise and redeemable conversion of preferred stock warrants		398,331		398,331
Total		86,489,613		88,817,118

Segment and Geographical Information (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Revenue by Type of Service

The following table sets forth total revenue by type of service (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Marketplace	$	56,766	$	46,186	$	164,180	$	130,124
Managed services		7,347		6,076		21,832		17,669
Total	$	64,113	$	52,262	$	186,012	$	147,793

Revenue by Geographic Area Based on Billing Address of Freelancers and Clients

The following table sets forth total revenue by geographic area based on the billing address of its freelancers and clients (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Freelancers:
United States	$	10,273	$	6,839	$	28,930	$	19,184
India		6,561		5,712		19,134		16,183
Philippines		4,377		3,795		12,535		10,839
Rest of world		20,168		17,519		59,352		50,767
Total freelancers		41,379		33,865		119,951		96,973
Clients:
United States		16,504		14,339		50,153		39,703
Rest of world		6,230		4,058		15,908		11,117
Total clients		22,734		18,397		66,061		50,820
Total	$	64,113	$	52,262	$	186,012	$	147,793

Subsequent Events (Tables)

9 Months Ended

Sep. 30, 2018

Subsequent Events [Abstract]

Impact of IPO on Certain Condensed Consolidated Balance Sheet Items on Pro Forma Basis

The following table shows, on a pro forma basis, the effect of the IPO as if the IPO had been completed as of September 30, 2018 (in thousands):

	As of September 30, 2018
Consolidated Balance Sheet Data:	Actual			Pro Forma Adjustments			Pro Forma
Cash	$	27,055		$	99,381		$	126,436
Total current assets		181,452			99,381			280,833
Other assets		6,240			(5,648	)		592
Total assets		318,842			93,733			412,575
Debt, current		29,594			(10,000	)		19,594
Total current liabilities		160,172			(10,000	)		150,172
Other liabilities, noncurrent		6,110			(4,714	)		1,396
Total liabilities		185,586			(14,714	)		170,872
Redeemable convertible preferred stock		166,486			(166,486	)		—
Common stock		4			7			11
Additional paid-in capital		104,900			274,926			379,826
Total stockholders' equity (deficit)		(33,230	)		274,933			241,703
Total liabilities, redeemable convertible preferred stock, and stockholders' equity (deficit)		318,842			93,733			412,575

Organization and Description of Business (Details)	12 Months Ended
Organization and Description of Business (Details)	Dec. 31, 2015 Platform
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of operating platforms consolidated	2

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)		1 Months Ended	9 Months Ended	12 Months Ended
	Oct. 03, 2018	Oct. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Subsidiary Sale Of Stock [Line Items]
Unrecognized tax benefits			$ 10,800,000
Interest expense or penalties related to unrecognized tax benefits			$ 0
Corporate tax rate			21.00%	35.00%
Tax cuts and jobs act of 2017 reduced percentage of taxable income for net operating loss			80.00%
Subsequent Event \| IPO
Subsidiary Sale Of Stock [Line Items]
Aggregate net proceeds from common stock	$ 109,400,000
Subsequent Event \| Common Stock \| IPO
Subsidiary Sale Of Stock [Line Items]
Number of shares issued and sold	7,840,908	7,840,908
Underwriters option to purchase additional shares	1,022,727
Shares issued, price per share	$ 15.00	$ 15.00
Subsequent Event \| Common Stock \| Selling Stockholders
Subsidiary Sale Of Stock [Line Items]
Number of shares issued and sold	6,507,288
Underwriters option to purchase additional shares	848,776

Fair Value Measurements - Financial Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financial Liabilities:
Total financial liabilities	$ 4,714	$ 1,104
Redeemable Convertible Preferred Stock Warrant Liability
Financial Liabilities:
Total financial liabilities	4,714	1,104
Level III
Financial Liabilities:
Total financial liabilities	4,714	1,104
Level III \| Redeemable Convertible Preferred Stock Warrant Liability
Financial Liabilities:
Total financial liabilities	$ 4,714	$ 1,104

Fair Value Measurements - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Level III \| Redeemable Convertible Preferred Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Increase in Level III due to remeasurement of redeemable convertible preferred stock warrant liability	$ 3.6

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Total property and equipment	$ 15,163	$ 11,442
Less: Accumulated depreciation	(8,903)	(7,928)
Property and equipment, net	6,260	3,514
Computer Equipment and Software
Property Plant And Equipment [Line Items]
Total property and equipment	5,250	5,385
Internal-use Software and Platform Development Costs
Property Plant And Equipment [Line Items]
Total property and equipment	4,988	2,318
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment	2,973	2,189
Office Furniture and Fixtures
Property Plant And Equipment [Line Items]
Total property and equipment	$ 1,952	$ 1,550

Balance Sheet Components - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Depreciation expense	$ 600,000	$ 400,000	$ 1,500,000	$ 1,100,000
Internal-use software and platform development costs capitalized	800,000	200,000	2,700,000	400,000
Amortization expense related to the internal-use software and platform development costs		0		0
Underlying assets	600,000		600,000
General and Administrative
Property Plant And Equipment [Line Items]
Amortization expense of intangible assets	$ 700,000	$ 700,000	$ 2,000,000	$ 2,100,000
User Relationships
Property Plant And Equipment [Line Items]
Remaining useful life				2 years 6 months	3 years 3 months 18 days

Balance Sheet Components - Intangible Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 31,856	$ 31,856
Accumulated Amortization	25,185	23,184
Net Carrying Amount	6,671	8,672
Trade Names
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,293	2,293
Accumulated Amortization	2,293	2,293
User Relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	18,678	18,678
Accumulated Amortization	12,007	10,006
Net Carrying Amount	6,671	8,672
Developed Technology
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,356	10,356
Accumulated Amortization	10,356	10,356
Domain Names
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	529	529
Accumulated Amortization	$ 529	$ 529

Balance Sheet Components - Estimated Future Amortization Expense for Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Finite Lived Intangible Assets Future Amortization Expense [Abstract]
Remainder of 2018	$ 670
2019	2,668
2020	2,668
2021	665
Net Carrying Amount	$ 6,671	$ 8,672

Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accrued Liabilities And Other Liabilities [Abstract]
Accrued compensation and related benefits	$ 7,239	$ 8,399
Accrued freelancer costs	615	134
Accrued indirect taxes	1,634	1,861
Accrued vendor expenses	5,696	4,198
Accrued payment processing fees	683	593
Other	1,044	845
Total accrued expenses and other current liabilities	$ 16,911	$ 16,030

Commitments and Contingencies - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Agreement	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Commitment And Contingencies [Line Items]
Number of non-cancelable operating lease agreements \| Agreement			4
2019	$ 3,569,000		$ 3,569,000
2020	4,223,000		4,223,000
2021	3,981,000		3,981,000
2022	4,095,000		4,095,000
2023	4,214,000		4,214,000
2024	3,039,000		3,039,000
Total minimum lease payments	24,157,000		24,157,000
Rent expense	1,100,000	$ 900,000	3,000,000	$ 2,800,000
Letters of credit outstanding, amount	600,000		$ 600,000		$ 800,000
Letter of credit expiration period			2019
Letter of Credit
Commitment And Contingencies [Line Items]
Amounts drawn against letters of credit			$ 0		$ 0
Office Space in San Francisco
Commitment And Contingencies [Line Items]
Sublease income		$ 300,000		$ 800,000
Sublease expiration period			2017-11
Total minimum lease payments	15,700,000		$ 15,700,000
Office Space in San Francisco \| Minimum
Commitment And Contingencies [Line Items]
2019	1,000,000		1,000,000
2020	1,000,000		1,000,000
2021	1,000,000		1,000,000
2022	1,000,000		1,000,000
2023	1,000,000		1,000,000
2024	1,000,000		1,000,000
Office Space in San Francisco \| Maximum
Commitment And Contingencies [Line Items]
2019	2,200,000		2,200,000
2020	2,200,000		2,200,000
2021	2,200,000		2,200,000
2022	2,200,000		2,200,000
2023	2,200,000		2,200,000
2024	2,200,000		2,200,000
Office Space in Chicago
Commitment And Contingencies [Line Items]
Total minimum lease payments	5,100,000		5,100,000
Office Space in Chicago \| Minimum
Commitment And Contingencies [Line Items]
2019	500,000		500,000
2020	500,000		500,000
2021	500,000		500,000
2022	500,000		500,000
2023	500,000		500,000
2024	500,000		500,000
Office Space in Chicago \| Maximum
Commitment And Contingencies [Line Items]
2019	1,000,000		1,000,000
2020	1,000,000		1,000,000
2021	1,000,000		1,000,000
2022	1,000,000		1,000,000
2023	1,000,000		1,000,000
2024	$ 1,000,000		$ 1,000,000

Commitments and Contingencies - Future Aggregate Minimum Lease Payments Under Non-Cancelable Operating Leases (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Remainder of 2018	$ 1,036
2019	3,569
2020	4,223
2021	3,981
2022	4,095
2023	4,214
2024	3,039
Total minimum lease payments	$ 24,157

Debt - Summary of Carrying Value of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 49,000	$ 34,000
Less: Unamortized debt discount issuance costs	(102)	(167)
Balance	48,898	33,833
Debt, current	(29,594)	(10,342)
Debt, noncurrent	$ 19,304	$ 23,491
Weighted-average interest rate	6.08%	5.93%
First Term Loan
Debt Instrument [Line Items]
Total debt	$ 15,000	$ 15,000
Second Term Loan
Debt Instrument [Line Items]
Total debt	9,000	9,000
Line of Credit
Debt Instrument [Line Items]
Total debt	$ 25,000	$ 10,000

Debt - Summary of Carrying Value of Debt (Parenthetical) (Details)	1 Months Ended	8 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) Installment	Aug. 31, 2018	Sep. 30, 2018 Installment	Dec. 31, 2017 Installment
Minimum
Debt Instrument [Line Items]
EBITDA, trailing period			3 months
Maximum
Debt Instrument [Line Items]
EBITDA, trailing period			12 months
First Term Loan
Debt Instrument [Line Items]
Interest only-payments term			18 months	18 months
Interest-only payments maturity month and year			2019-03	2019-03
Number of equal monthly installments of principal and interest			36	36
Debt, maturity month and year			Mar. 31, 2022	Mar. 31, 2022
First Term Loan \| Prime Rate
Debt Instrument [Line Items]
Debt, variable rate			0.25%	0.25%
Second Term Loan
Debt Instrument [Line Items]
Interest only-payments term			11 months	11 months
Interest-only payments maturity month and year			2018-10	2018-10
Number of equal monthly installments of principal and interest			47	47
Debt, maturity month and year			Sep. 30, 2022	Sep. 30, 2022
Second Term Loan \| Achieved trailing six-month EBITDA of at least $1.0 million
Debt Instrument [Line Items]
Interest-only payments maturity month and year	2019-03
Number of equal monthly installments of principal and interest	42
EBITDA, trailing period	6 months
Second Term Loan \| Minimum \| Achieved trailing six-month EBITDA of at least $1.0 million
Debt Instrument [Line Items]
EBITDA \| $	$ 1,000,000
Second Term Loan \| Prime Rate
Debt Instrument [Line Items]
Debt, variable rate	0.25%	5.25%
Second Term Loan \| Prime Rate \| Achieved trailing six-month EBITDA of at least $1.0 million
Debt Instrument [Line Items]
Debt, variable rate	5.25%
Line of Credit
Debt Instrument [Line Items]
Debt, maturity month and year			Sep. 30, 2020

Debt - Additional Information (Details) - USD ($)		1 Months Ended				8 Months Ended	9 Months Ended	12 Months Ended
Debt - Additional Information (Details) - USD ($)	Oct. 01, 2018	Oct. 31, 2018	Sep. 30, 2018	Nov. 30, 2017	Sep. 30, 2017	Aug. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 49,000,000	$ 30,000,000
Debt issuance costs				200,000
Proceeds from borrowings			$ 15,000,000
Adjusted liquidity ratio							1.30%
Net proceeds			$ 50,000,000
Upon achieving adjusted net revenue of at least $49.0 million in a trailing three-month period
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					40,000,000
Revolving Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					15,000,000
Proceeds from borrowings				10,000,000
Revolving Line of Credit \| Upon achieving adjusted net revenue of at least $49.0 million in a trailing three-month period
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					25,000,000
First Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount					15,000,000
First Term Loan \| Prime Rate
Debt Instrument [Line Items]
Debt, variable rate							0.25%	0.25%
Second Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount				9,000,000
Second Term Loan \| Prime Rate
Debt Instrument [Line Items]
Debt, variable rate			0.25%			5.25%
Term Loan
Debt Instrument [Line Items]
Proceeds from borrowings				$ 9,000,000
Loan Agreement \| Subsequent Event
Debt Instrument [Line Items]
Repayment of indebtness owed	$ 15,000,000	$ 25,000,000
Minimum
Debt Instrument [Line Items]
EBITDA, trailing period							3 months
Minimum \| Upon achieving adjusted net revenue of at least $49.0 million in a trailing three-month period
Debt Instrument [Line Items]
Adjusted net revenue					$ 49,000,000
Maximum
Debt Instrument [Line Items]
EBITDA, trailing period							12 months

Redeemable Convertible Preferred Stock - Schedule Of Redeemable Convertible Preferred Stock (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares authorized	76,141,345	76,141,345
Redeemable convertible preferred stock, shares issued	61,279,079	61,279,079
Redeemable convertible preferred stock, shares outstanding	61,279,079	61,279,079
Net Carrying Value	$ 166,486	$ 166,486
Redeemable convertible preferred stock, liquidation preference	$ 120,047	$ 120,047
Series A-1 Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares authorized	10,141,345	10,141,345
Redeemable convertible preferred stock, shares issued	9,142,770	9,142,770
Redeemable convertible preferred stock, shares outstanding	9,142,770	9,142,770
Net Carrying Value	$ 72,181	$ 72,181
Redeemable convertible preferred stock, liquidation preference	$ 91,427	$ 91,427
Series A-2 Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares authorized	60,000,000	60,000,000
Redeemable convertible preferred stock, shares issued	47,124,931	47,124,931
Redeemable convertible preferred stock, shares outstanding	47,124,931	47,124,931
Net Carrying Value	$ 65,853	$ 65,853
Redeemable convertible preferred stock, liquidation preference	$ 5	$ 5
Series B-1 Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares authorized	5,854,982	5,854,982
Redeemable convertible preferred stock, shares issued	4,866,360	4,866,360
Redeemable convertible preferred stock, shares outstanding	4,866,360	4,866,360
Net Carrying Value	$ 27,628	$ 27,628
Redeemable convertible preferred stock, liquidation preference	$ 27,787	$ 27,787
Series B-2 Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares authorized	145,018	145,018
Redeemable convertible preferred stock, shares issued	145,018	145,018
Redeemable convertible preferred stock, shares outstanding	145,018	145,018
Net Carrying Value	$ 824	$ 824
Redeemable convertible preferred stock, liquidation preference	$ 828	$ 828

Preferred and Common Stock Warrants - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2018	May 31, 2018	Dec. 31, 2017	Jun. 30, 2017
IPO
Class Of Warrant Or Right [Line Items]
Common stock warrant exercisable conversion	10.00%
Other Liabilities, Noncurrent
Class Of Warrant Or Right [Line Items]
Fair value of redeemable convertible preferred stock liability	$ 4.7		$ 1.1
Redeemable Convertible Preferred Stock Warrants, One \| Series A-1 Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Exercise price of warrants				$ 3.13
Redeemable Convertible Preferred Stock Warrants, One \| Series A-1 Redeemable Convertible Preferred Stock \| Maximum
Class Of Warrant Or Right [Line Items]
Number of shares issued upon exercisable of warrants				26,000
Redeemable Convertible Preferred Stock Warrants, One \| Series A-2 Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Exercise price of warrants				$ 3.13
Redeemable Convertible Preferred Stock Warrants, One \| Series A-2 Redeemable Convertible Preferred Stock \| Maximum
Class Of Warrant Or Right [Line Items]
Number of shares issued upon exercisable of warrants				57,181
Redeemable Convertible Preferred Stock Warrants \| Series A-1 Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Exercise price of warrants	$ 3.13
Redeemable Convertible Preferred Stock Warrants \| Series A-1 Redeemable Convertible Preferred Stock \| Maximum
Class Of Warrant Or Right [Line Items]
Number of shares issued upon exercisable of warrants	124,506
Redeemable Convertible Preferred Stock Warrants \| Series A-2 Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Exercise price of warrants	$ 3.13
Redeemable Convertible Preferred Stock Warrants \| Series A-2 Redeemable Convertible Preferred Stock \| Maximum
Class Of Warrant Or Right [Line Items]
Number of shares issued upon exercisable of warrants	273,825
Common Stock Warrant
Class Of Warrant Or Right [Line Items]
Exercise price of warrants	$ 0.06
Shares issued upon exercise of warrants		45,286
Common Stock Warrant \| Tides Foundation
Class Of Warrant Or Right [Line Items]
Number of shares issued upon exercisable of warrants		500,000
Exercise price of warrants		$ 0.01
Common Stock Warrant \| Maximum
Class Of Warrant Or Right [Line Items]
Number of shares issued upon exercisable of warrants	45,286

Preferred and Common Stock Warrants - Assumptions Used to Calculate Fair Value of Outstanding Warrants (Details) - Redeemable Convertible Preferred Stock Warrants	Sep. 30, 2018	Dec. 31, 2017
Dividend Yield
Class Of Warrant Or Right [Line Items]
Outstanding warrants measurement input	0	0
Expected Term
Class Of Warrant Or Right [Line Items]
Outstanding warrants measurement input	2 years	2 years 9 months
Risk-Free Interest Rates
Class Of Warrant Or Right [Line Items]
Outstanding warrants measurement input	2.8	1.8
Expected Volatility
Class Of Warrant Or Right [Line Items]
Outstanding warrants measurement input	36.8	34.6

Common Stock - Additional Information (Details) - shares	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Equity [Abstract]
Common Stock, voting rights	one vote per share
Common stock, shares authorized	150,000,000	150,000,000

Common Stock - Summary of Common Stock Shares Reserved for Future Issuance (Details) - shares	Sep. 30, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
Common stock shares reserved for future issuance	86,687,472	89,292,466
Options Issued and Outstanding
Class Of Stock [Line Items]
Common stock shares reserved for future issuance	24,312,203	23,607,746
Warrant To Purchase Redeemable Convertible Preferred Stock
Class Of Stock [Line Items]
Common stock shares reserved for future issuance	398,331	398,331
Warrant To Purchase Common Stock
Class Of Stock [Line Items]
Common stock shares reserved for future issuance	500,000	45,286
Conversion of Redeemable Convertible Preferred Stock
Class Of Stock [Line Items]
Common stock shares reserved for future issuance	61,279,079	61,279,079
Remaining Shares Reserved For Future Issuances Under 2014 Plan
Class Of Stock [Line Items]
Common stock shares reserved for future issuance	197,859	3,962,024

Stock-Based Compensation - Summary of Activity under Stock Option Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Shares Available for Grant
Balances at December 31, 2017	3,962,024
Authorized	100,000
Granted	(4,468,523)
Forfeited and cancelled	604,358
Balances at September 30, 2018	197,859	3,962,024
Number of Shares Underlying Outstanding Options
Balances at December 31, 2017	23,607,746
Granted	4,468,523
Exercised	(3,159,708)
Forfeited and cancelled	(604,358)
Balances at September 30, 2018	24,312,203	23,607,746
Weighted-Average Exercise Price
Weighted-Average Exercise Price, Balances at December 31, 2017	$ 3.10
Weighted-Average Exercise Price, Granted	5.88
Weighted-Average Exercise Price, Exercised	2.22
Weighted-Average Exercise Price, Forfeited and cancelled	3.72
Weighted-Average Exercise Price, Balances at September 30, 2018	$ 3.71	$ 3.10
Weighted-Average Remaining Contractual Term, Outstanding	7 years 4 months 9 days	7 years 4 months 20 days
Aggregate Intrinsic Value, Outstanding	$ 269,431	$ 22,260

Stock-Based Compensation - Additional Information (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jul. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate stock-based compensation expense	$ 1,986,000	$ 1,526,000		$ 5,667,000	$ 4,817,000
Common Stock \| Secondary Market Transactions
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares issued and sold	0	0	195,000
Aggregate shares sold, value	$ 0	$ 0	$ 900,000
Aggregate stock-based compensation expense					$ 200,000
Common Stock \| Secondary Market Transactions \| Average
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Average share price			$ 4.50
Stephane Kasriel, Chief Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option to purchase shares of common stock, granted						1,860,000
Stock option exercise price						$ 6.61

Stock-Based Compensation - Summary of Components of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 1,986	$ 1,526	$ 5,667	$ 4,817
Cost of revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation	59	48	164	241
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation	623	432	1,711	1,271
Sales and marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation	355	312	1,026	967
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 949	$ 734	$ 2,766	$ 2,338

Net Loss Per Share Attributable to Common Stockholders - Summary of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income (loss)	$ (7,346)	$ (301)	$ (14,542)	$ 1,068
Less: Undistributed earnings allocable to preferred stockholders				$ (1,068)
Net loss attributable to common stockholders	$ (7,346)	$ (301)	$ (14,542)
Denominator:
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	36,069,502	33,298,773	35,129,250	32,760,339
Net loss per share attributable to common stockholders, basic and diluted	$ (0.20)	$ (0.01)	$ (0.41)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Loss Per Share Attributable to Common Stockholders - Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from computation of diluted net loss per share attributable to common stockholders	86,489,613	88,817,118
Options to Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from computation of diluted net loss per share attributable to common stockholders	24,312,203	22,825,933
Common Stock Issuable upon Conversion of Redeemable Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from computation of diluted net loss per share attributable to common stockholders	61,279,079	65,547,568
Common Stock Issuable upon Exercise of Common Stock Warrant
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from computation of diluted net loss per share attributable to common stockholders	500,000	45,286
Common Stock Issuable upon Exercise and Redeemable Conversion of Preferred Stock Warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from computation of diluted net loss per share attributable to common stockholders	398,331	398,331

Segment and Geographical Information - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Segment	Sep. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| Segment			1
Number of reportable segments \| Segment			1
Revenue from service, client payment processing and administrative fees	$ 64,113	$ 52,262	$ 186,012	$ 147,793
Freelancers
Segment Reporting Information [Line Items]
Revenue from service, client payment processing and administrative fees	41,379	33,865	119,951	96,973
Clients
Segment Reporting Information [Line Items]
Revenue from service, client payment processing and administrative fees	22,734	18,397	66,061	50,820
Market Place
Segment Reporting Information [Line Items]
Revenue from service, client payment processing and administrative fees	56,766	46,186	164,180	130,124
Market Place \| Freelancers
Segment Reporting Information [Line Items]
Revenue from service, client payment processing and administrative fees	36,500	31,000	108,500	88,600
Market Place \| Clients
Segment Reporting Information [Line Items]
Revenue from service, client payment processing and administrative fees	$ 9,000	$ 7,300	$ 25,800	$ 20,600

Segment and Geographical Information - Revenue by Type of Service (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation Of Revenue [Line Items]
Revenue	$ 64,113	$ 52,262	$ 186,012	$ 147,793
Market Place
Disaggregation Of Revenue [Line Items]
Revenue	56,766	46,186	164,180	130,124
Managed Service
Disaggregation Of Revenue [Line Items]
Revenue	$ 7,347	$ 6,076	$ 21,832	$ 17,669

Segment and Geographical Information - Revenue by Geographic Area Based on Billing Address of Freelancers and Clients (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 64,113	$ 52,262	$ 186,012	$ 147,793
Freelancers
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	41,379	33,865	119,951	96,973
Freelancers \| United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	10,273	6,839	28,930	19,184
Freelancers \| India
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	6,561	5,712	19,134	16,183
Freelancers \| Philippines
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	4,377	3,795	12,535	10,839
Freelancers \| Rest of world
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	20,168	17,519	59,352	50,767
Clients
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	22,734	18,397	66,061	50,820
Clients \| United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	16,504	14,339	50,153	39,703
Clients \| Rest of world
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 6,230	$ 4,058	$ 15,908	$ 11,117

401(k) Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
401(k) Additional Information (Details) - USD ($)	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Compensation And Retirement Disclosure [Abstract]
Company matching cash contributions			50.00%
Maximum annual contributions per employee, Amount			$ 5,000
Expense for matching contributions	$ 300,000	$ 200,000	$ 1,400,000	$ 1,000,000

Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	9 Months Ended
	Oct. 03, 2018	Oct. 01, 2018	Oct. 31, 2018	Sep. 30, 2018	Aug. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Common stock shares reserved for future issuance				86,687,472		89,292,466
Other Liabilities, Noncurrent
Subsequent Event [Line Items]
Fair value of redeemable convertible preferred stock liability				$ 4.7		$ 1.1
IPO \| Pro Forma Adjustments
Subsequent Event [Line Items]
Aggregate net proceeds from common stock				109.4
Deferred offering costs				$ 5.6
Common stock, conversion basis				one-for-one
Common stock conversion basis ratio				100.00%
IPO \| Pro Forma Adjustments \| Other Liabilities, Noncurrent
Subsequent Event [Line Items]
Fair value of redeemable convertible preferred stock liability				$ 4.7
Common Stock \| IPO \| Pro Forma Adjustments
Subsequent Event [Line Items]
Underwriting discounts and commissions				$ 8.2
Conversion of redeemable convertible preferred stock to common stock shares				61,279,079
Loan Agreement \| IPO \| Pro Forma Adjustments
Subsequent Event [Line Items]
Repayments of long-term debt				$ 10.0
Subsequent Event \| IPO
Subsequent Event [Line Items]
Aggregate net proceeds from common stock	$ 109.4
Subsequent Event \| Common Stock \| IPO
Subsequent Event [Line Items]
Shares issued	7,840,908		7,840,908
Shares issued, price per share	$ 15.00		$ 15.00
Subsequent Event \| Loan Agreement
Subsequent Event [Line Items]
Repayments of long-term debt		$ 15.0	$ 25.0
2018 Equity Incentive Plan
Subsequent Event [Line Items]
Common stock shares reserved for future issuance					10,500,000
2018 Equity Incentive Plan \| Restricted Stock Units \| Subsequent Event
Subsequent Event [Line Items]
Shares granted	327,000
2018 Equity Incentive Plan \| Restricted Stock Units \| Subsequent Event \| Board of Directors
Subsequent Event [Line Items]
Shares granted	55,000
Vesting period	1 year
2018 Equity Incentive Plan \| Restricted Stock Units \| Subsequent Event \| Employees
Subsequent Event [Line Items]
Vesting period	4 years

Subsequent Events - Summary of Impact of IPO on Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Condensed Balance Sheet Statements Captions [Line Items]
Cash	$ 27,055	$ 21,595
Total current assets	181,452	144,126
Other assets, noncurrent	6,240	658
Total assets	318,842	275,189
Debt, current	29,594	10,342
Total current liabilities	160,172	114,643
Other liabilities, noncurrent	6,110	1,936
Total liabilities	185,586	140,070
Net Carrying Value	166,486	166,486
Common stock, $0.0001 par value; 150,000,000 shares authorized as of September 30, 2018 and December 31, 2017; 36,945,317 and 33,740,323 shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively	4	3
Additional paid-in capital	104,900	92,222
Total stockholders' equity (deficit)	(33,230)	(31,367)
Total liabilities, redeemable convertible preferred stock, and stockholders' equity (deficit)	318,842	$ 275,189
Pro Forma Adjustments \| IPO
Condensed Balance Sheet Statements Captions [Line Items]
Cash	99,381
Total current assets	99,381
Other assets, noncurrent	(5,648)
Total assets	93,733
Debt, current	(10,000)
Total current liabilities	(10,000)
Other liabilities, noncurrent	(4,714)
Total liabilities	(14,714)
Net Carrying Value	(166,486)
Common stock, $0.0001 par value; 150,000,000 shares authorized as of September 30, 2018 and December 31, 2017; 36,945,317 and 33,740,323 shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively	7
Additional paid-in capital	274,926
Total stockholders' equity (deficit)	274,933
Total liabilities, redeemable convertible preferred stock, and stockholders' equity (deficit)	93,733
Pro Forma \| IPO
Condensed Balance Sheet Statements Captions [Line Items]
Cash	126,436
Total current assets	280,833
Other assets, noncurrent	592
Total assets	412,575
Debt, current	19,594
Total current liabilities	150,172
Other liabilities, noncurrent	1,396
Total liabilities	170,872
Common stock, $0.0001 par value; 150,000,000 shares authorized as of September 30, 2018 and December 31, 2017; 36,945,317 and 33,740,323 shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively	11
Additional paid-in capital	379,826
Total stockholders' equity (deficit)	241,703
Total liabilities, redeemable convertible preferred stock, and stockholders' equity (deficit)	$ 412,575