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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	Apr. 30, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
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		107,160,359

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 49,220	$ 129,128
Marketable securities	71,999	0
Funds held in escrow, including funds in transit	120,085	98,186
Trade and client receivables – net of allowance of $2,406 and $2,832 as of March 31, 2019 and December 31, 2018, respectively	48,265	22,315
Prepaid expenses and other current assets	6,681	6,253
Total current assets	296,250	255,882
Property and equipment, net	12,604	10,815
Goodwill	118,219	118,219
Intangible assets, net	5,337	6,004
Other assets, noncurrent	1,389	653
Total assets	433,799	391,573
Current liabilities
Accounts payable	1,542	2,073
Escrow funds payable	120,085	98,186
Debt, current	32,569	5,671
Accrued expenses and other current liabilities	15,606	20,948
Deferred revenue	891	722
Total current liabilities	170,693	127,600
Debt, noncurrent	16,354	18,239
Other liabilities, noncurrent	2,780	1,989
Total liabilities	189,827	147,828
Commitments and contingencies (Note 5)
Stockholders’ equity
Common stock, $0.0001 par value; 490,000,000 shares authorized as of March 31, 2019 and December 31, 2018; 106,729,758 and 106,454,321 shares issued and outstanding as of March 31, 2019 and December 31, 2018, respectively	11	11
Additional paid-in capital	392,188	387,233
Accumulated deficit	(148,227)	(143,499)
Total stockholders' equity	243,972	243,745
Total liabilities and stockholders' equity	$ 433,799	$ 391,573

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,406	$ 2,832
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	490,000,000	490,000,000
Common stock, shares issued (in shares)	106,729,758	106,454,321
Common stock, shares outstanding (in shares)	106,729,758	106,454,321

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 68,924	$ 59,218
Cost of revenue	21,125	19,617
Gross profit	47,799	39,601
Operating expenses
Research and development	15,800	13,491
Sales and marketing	20,518	19,673
General and administrative	15,677	11,176
Provision for transaction losses	637	1,270
Total operating expenses	52,632	45,610
Loss from operations	(4,833)	(6,009)
Interest expense	373	529
Other (income) expense, net	(479)	249
Loss before income taxes	(4,727)	(6,787)
Income tax benefit (provision)	(1)	3
Net loss	$ (4,728)	$ (6,784)
Net loss per share, basic and diluted (in dollars per share)	$ (0.04)	$ (0.20)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	106,639,079	34,192,856

CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCKAND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Redeemable Convertible Preferred Stock (in shares)	61,279,079
Redeemable Convertible Preferred Stock	$ 166,486
Beginning balance (in shares) at Dec. 31, 2017		33,740,323
Beginning balance at Dec. 31, 2017	(31,367)	$ 3	$ 92,222	$ (123,592)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		914,037
Issuance of common stock upon exercise of stock options	1,218	$ 1	1,217
Stock-based compensation expense	1,888		1,888
Net loss	(6,784)			(6,784)
Ending balance (in shares) at Mar. 31, 2018		34,654,360
Ending balance at Mar. 31, 2018	$ (35,045)	$ 4	95,327	(130,376)
Redeemable Convertible Preferred Stock (in shares)	61,279,079
Redeemable Convertible Preferred Stock	$ 166,486
Redeemable Convertible Preferred Stock (in shares)	0
Redeemable Convertible Preferred Stock	$ 0
Beginning balance (in shares) at Dec. 31, 2018		106,454,321
Beginning balance at Dec. 31, 2018	$ 243,745	$ 11	387,233	(143,499)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	273,105	273,105
Issuance of common stock upon exercise of stock options	$ 767		767
Stock-based compensation expense	4,188		4,188
Issuance of common stock for settlement of RSUs (in shares)		2,332
Net loss	(4,728)			(4,728)
Ending balance (in shares) at Mar. 31, 2019		106,729,758
Ending balance at Mar. 31, 2019	$ 243,972	$ 11	$ 392,188	$ (148,227)
Redeemable Convertible Preferred Stock (in shares)	0
Redeemable Convertible Preferred Stock	$ 0

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (4,728)	$ (6,784)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Provision for transaction losses	415	1,270
Depreciation and amortization	1,532	1,064
Amortization of debt issuance costs	13	39
Amortization of discount on purchases of marketable securities	(283)	0
Change in fair value of redeemable convertible preferred stock warrant liability	0	318
Change in fair value of Tides Foundation common stock warrant	252	0
Stock-based compensation expense	4,295	1,888
Loss on disposal of fixed assets	0	29
Changes in operating assets and liabilities:
Trade and client receivables	(26,431)	(7,660)
Prepaid expenses and other assets	(991)	(1,111)
Accounts payable	(596)	51
Accrued expenses and other liabilities	(3,042)	15,805
Deferred revenue	169	91
Net cash provided by (used in) operating activities	(29,395)	5,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(71,713)	0
Decrease (increase) in restricted cash	250	(101)
Purchases of property and equipment	(3,604)	(462)
Internal-use software and platform development costs	(1,210)	(626)
Net cash used in investing activities	(76,277)	(1,189)
CASH FLOWS FROM FINANCING ACTIVITIES:
Changes in funds held in escrow, including funds in transit	(21,899)	5,654
Changes in escrow funds payable	21,899	(5,654)
Proceeds from exercises of stock options and common stock warrants	764	1,218
Proceeds from borrowings on debt	25,000	0
Payments of costs related to the initial public offering	0	(163)
Net cash provided by financing activities	25,764	1,055
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(79,908)	4,866
Cash and cash equivalents, beginning of period	129,128	21,595
Cash and cash equivalents, end of period	49,220	26,461
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	357	511
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Property and equipment purchased but not yet paid	1,210	1,149
Unpaid deferred offering costs	$ 0	$ 1,057

Organization and Description of Business	3 Months Ended
Organization and Description of Business	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	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 (the “Elance-oDesk Combination”) of Elance, Inc. (“Elance”) and oDesk Corporation (“oDesk”). The Company changed its name to Elance-oDesk, Inc. 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 currently headquartered in Mountain View, California. Unless otherwise expressly stated or the context otherwise requires, the terms “Upwork” and the “Company” in these notes to the condensed consolidated financial statements refer to Upwork and its wholly-owned subsidiaries. Initial Public Offering In October 2018, the Company completed its initial public offering (“IPO”), in which the Company issued and sold an aggregate of 7,840,908 of the Company’s common stock, including 1,022,727 shares pursuant to the exercise of the underwriters’ option to purchase additional shares. The shares were sold to the underwriters at the IPO price of $15.00 per share less an underwriting discount of $1.05 per share. The Company received aggregate net proceeds of $109.4 million from the IPO after deducting underwriting discounts and commissions but before deducting offering expenses payable by the Company.

Basis of Presentation and Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

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 Quarterly Report should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (the “Annual Report”), filed with the SEC on March 7, 2019.

The condensed consolidated balance sheet as of December 31, 2018 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, changes in stockholders’ equity and cash flows for the interim periods, but do not purport to be indicative of the results of operations or financial condition to be anticipated for the full year ending December 31, 2019.

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.

Significant Accounting Policies

The significant accounting policies applied in the Company’s audited consolidated financial statements, as disclosed in the Annual Report, are applied consistently in these unaudited interim condensed consolidated financial statements, except as noted below.

Marketable Securities

In the first quarter of 2019, the Company purchased various short-term, marketable securities consisting of commercial paper, treasury bills, and U.S. government securities, all of which have contractual maturities within 12 months from the date of purchase and are classified as available-for-sale marketable securities. These marketable securities are carried at estimated fair value with unrealized gains and losses, net of taxes, included within the stockholders’ equity section of the Company’s condensed consolidated balance sheet. The Company periodically reviews its available-for-sale marketable securities for other-than-temporary impairments. The Company considers factors such as the duration, severity, and the reason for any decline in value, the potential recovery period, and its intent to sell. For debt securities, the Company also considers whether (i) it is more likely than not that the Company will be required to sell the debt securities before recovery of their amortized cost basis and (ii) the amortized cost basis cannot be recovered as a result of credit losses. Unrealized losses are charged against other (income) expense, net when a decline in fair value is determined to be other-than-temporary. The Company determines realized gains or losses from the sale of marketable securities on a specific identification method and records such gains or losses as other (income) expense, net within the Company’s condensed consolidated statements of operations.

Income Taxes

The Company’s income tax provision for interim periods is determined using an estimate of the Company’s annual effective tax rate, adjusted for discrete items arising in the quarter. The Company’s effective tax rate differs from the U.S. statutory tax rate primarily due to valuation allowances on the deferred tax assets as it is more likely than not that some or all of the Company’s deferred tax assets will not be realized. The Company continues to maintain a full valuation allowance against its net deferred tax assets. Due to tax losses and the offsetting valuation allowance, the income tax benefit (provision) for the three months ended March 31, 2019 and 2018, respectively, was immaterial to the Company’s condensed consolidated financial statements.

Recent Accounting Pronouncements Not Yet Adopted

As an “emerging growth company,” the Jumpstart Our Business Startups Act (the “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 Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers. Accounting Standards Codification 606—Revenue from Contracts with Customers (“ASC 606”) supersedes the revenue recognition requirements in ASC 605—Revenue Recognition, 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 (“full retrospective method”) or retrospectively with the cumulative effect recognized as of the date of adoption (“modified retrospective method”).

The Company plans to adopt the new standard for the year ending December 31, 2019 during the fourth quarter of 2019, using the modified retrospective method. Interim reporting under the new standard will not be required until 2020. The Company is continuing to evaluate the potential impact that the implementation of this standard will have on its consolidated financial statements, specifically related to the following items:


•	identification of performance obligations;


•	principal agent considerations;


•	whether costs to obtain a contract with a customer will be capitalized or expensed;


•	timing of revenue recognition; and


•	revenue disclosures which are expected to expand and may require judgment in certain areas.

The Company has concluded that the discounts offered under the Company’s tiered pricing program for freelancer service fees result in a “material right” as that term is defined in ASC 606. However, the Company has not yet determined the potential adjustment amount. The Company currently does not expect significant changes to its systems and processes from the adoption of the new standard.

In January 2016, the FASB issued Accounting Standards Update 2016-01, Financial Instruments (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). ASU 2016-01 makes targeted improvements to GAAP regarding financial instruments. ASU 2016-01 eliminates the requirement to classify investments in equity securities with readily determinable fair values into trading or available-for-sale categories and requires those equity securities to be measured at fair value with changes in fair value recognized in net earnings rather than in other comprehensive income. ASU 2016-01 also revises certain presentation and disclosure requirements. Under ASU 2016-01, accounting for investments in debt securities remains essentially unchanged. The guidance is effective for the Company for fiscal year 2020 and interim periods beginning fiscal year 2021. Early adoption is not permitted. The Company has not yet evaluated the impact of adopting this guidance on its consolidated financial statements and related disclosures.

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 anticipates the effect of adopting this update will be recognizing right-of-use assets and corresponding lease liabilities for leases where the Company is the lessee, primarily comprised of leases for facilities. The Company is continuing to assess all implications of this new guidance on its consolidated financial statements.

Fair Value Measurements

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

The Company defines fair value as the exchange price that would be received from the 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 I and Level II assets as of March 31, 2019 and December 31, 2018. The following tables set forth the fair value of the Company’s financial assets measured at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands):



	March 31, 2019
	Level I		Level II		Level III		Total
Cash equivalents
Money market funds	$	32,028	$	—	$	—	$	32,028
Commercial paper	—		3,097		—		3,097
Marketable securities
Commercial paper	—		52,123		—		52,123
Treasury bills	4,960		—		—		4,960
U.S. government securities	14,916		—		—		14,916
Total financial assets	$	51,904	$	55,220	$	—	$	107,124



	December 31, 2018
	Level I		Level II		Level III		Total
Cash equivalents—money market funds	$	117,138	$	—	$	—	$	117,138
Total financial assets	$	117,138	$	—	$	—	$	117,138

Prior to its IPO, the Company measured its redeemable convertible preferred stock warrant liability at fair value on a recurring basis, and it was classified within Level III because the warrants were valued using a Black-Scholes valuation model, for which some inputs were unobservable in the market. The Company recorded $0.3 million related to the revaluation of its redeemable convertible preferred stock warrant liability, which is included in other (income) expense, net in the Company’s condensed consolidated statement of operations for the three months ended March 31, 2018.

Upon the closing of the IPO in October 2018, the redeemable convertible preferred stock warrant converted to a common stock warrant. As such, the Company reclassified its redeemable convertible preferred stock warrant liability to additional paid-in capital.

- 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

3 Months Ended

Mar. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

Cash and Cash Equivalents

Cash and cash equivalents consisted of the following (in thousands):



	March 31, 2019		December 31, 2018
Cash	$	14,095	$	11,990
Money market funds	32,028		117,138
Commercial paper	3,097		—
Total cash and cash equivalents	$	49,220	$	129,128

Marketable Securities

Marketable securities consisted of the following (in thousands):



	March 31, 2019
Commercial paper	$	52,123
Treasury bills	4,960
U.S. government securities	14,916
Total marketable securities	$	71,999

For the three months ended March 31, 2019, the gross unrealized gains and losses on the Company’s marketable securities were immaterial. As of March 31, 2019, the Company considered any decreases in market value to be temporary in nature and did not consider any of the Company’s marketable securities to be other-than-temporarily impaired. As such, the Company did not record any impairment charges during the three months ended March 31, 2019.

Property and Equipment, Net

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



	March 31, 2019			December 31, 2018
Computer equipment and software	$	3,475		$	3,189
Internal-use software and platform development	7,390			6,287
Leasehold improvements	6,509			5,783
Office furniture and fixtures	2,524			2,545
Total property and equipment	19,898			17,804
Less: accumulated depreciation	(7,294		)	(6,989		)
Property and equipment, net	$	12,604		$	10,815

Depreciation expense related to property and equipment was $0.8 million and $0.4 million for the three months ended March 31, 2019 and 2018, respectively.

The Company capitalized $1.1 million and $0.6 million of internal-use software and platform development costs during the three months ended March 31, 2019 and 2018, respectively. Amortization expense related to the capitalized internal-use software and platform development costs was immaterial for the three months ended March 31, 2019. There was no amortization expense for the three months ended March 31, 2018 related to the internal-use software and platform development costs as the underlying assets had not been placed into service as of March 31, 2018.

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):



	March 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade names	$	2,293	$	2,293	$	—
User relationships	18,678		13,341		5,337
Developed technology	10,356		10,356		—
Domain names	529		529		—
Total	$	31,856	$	26,519	$	5,337



	December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade names	$	2,293	$	2,293	$	—
User relationships	18,678		12,674		6,004
Developed technology	10,356		10,356		—
Domain names	529		529		—
Total	$	31,856	$	25,852	$	6,004

Total amortization expense of intangible assets was $0.7 million for each of the three months ended March 31, 2019 and 2018. Amortization expense was included in general and administrative expenses. As of March 31, 2019, the remaining useful life for user relationships was 2.0 years. As of December 31, 2018, the remaining useful life for user relationships was 2.3 years.

As of March 31, 2019, the estimated future amortization expense for the acquired intangible assets was as follows (in thousands):



	March 31, 2019
Remainder of 2019	$	2,001
2020	2,668
2021	668
Total estimated future amortization expense	$	5,337

Accrued Expenses and Other Current Liabilities

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



	March 31, 2019		December 31, 2018
Accrued compensation and related benefits	$	5,419	$	9,314
Accrued freelancer costs	823		2,465
Accrued indirect taxes	1,888		1,630
Accrued vendor expenses	5,993		6,002
Accrued payment processing fees	811		715
Other	672		822
Total accrued expenses and other current liabilities	$	15,606	$	20,948

Commitments and Contingencies

3 Months Ended

Mar. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Operating Leases

The Company leases office space under five non-cancellable operating lease agreements, which expire from 2019 through 2028. The terms of the office leases contain rent escalation clauses, rent holidays, and/or tenant improvement allowances. The Company recognizes rent expense on a straight-line basis over the non-cancellable 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, and/or tenant improvement allowances, the Company applies them in the determination of straight-line rent expense over the lease term.

In February 2019, the Company entered into an agreement for a non-cancellable operating lease for new office space in Santa Clara, California. The Company took possession of the Santa Clara office space for its corporate headquarters during the first quarter of 2019 and plans to move its corporate headquarters and related operations in the second quarter of 2019 shortly after the termination of its Mountain View, California office lease. From June 1, 2019 through October 15, 2028, total minimum lease payments under the lease agreement are $14.3 million, with lease payments ranging from $1.4 million to $1.8 million per year.

In 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 2018, the Company entered into an agreement for a non-cancellable operating lease for new office space in Chicago through October 2024. In December 2018, the Company amended this agreement (the “First Amendment”) to extend the term of the original lease from October 2024 to April 2025 and to lease additional office space to accommodate continued headcount growth. From June 1, 2019 through April 30, 2025, total minimum lease payments under the original lease agreement and the First Amendment are $10.3 million, with lease payments ranging from $0.5 million to $2.0 million per year from 2019 to 2025. The Company moved its Chicago-based operations to this new office space in January 2019. In connection with this move, the Company entered into two sublease agreements that provided for the sublease of the two office spaces the Company occupied prior to its execution of the new operating lease. The Company exited the two spaces in December 2018 and January 2019, respectively. As a result, the Company accelerated the depreciation expense of its leasehold improvements and furniture and fixtures on the cease-use date for the space exited in January 2019 and accordingly recorded $0.3 million of accelerated depreciation expense during the three months ended March 31, 2019. The expected sublease income from the two sublease agreements is reflected in the future aggregate minimum lease payment table below.

As of March 31, 2019, future aggregate minimum lease payments under the non-cancellable operating leases, net of sublease income, were as follows (in thousands):



	March 31, 2019
Remainder of 2019	$	2,728
2020	5,861
2021	6,342
2022	6,588
2023	6,776
Thereafter	13,137
Less: sublease income	(706		)
Total	$	40,726

Rent expense was $1.2 million and $1.0 million for the three months ended March 31, 2019 and 2018, respectively.

Letters of Credit

In conjunction with the operating lease agreements, as of March 31, 2019 and December 31, 2018, the Company had four and three irrevocable letters of credit outstanding in the aggregate amount of $1.1 million and $0.8 million, respectively. The letters of credit are collateralized by restricted cash in the same respective amounts and begin to expire in 2019. No amounts had been drawn against these letters of credit as of March 31, 2019 and December 31, 2018.

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 March 31, 2019 and December 31, 2018, 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

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Debt

The following table presents the carrying value of the Company’s debt obligations as of March 31, 2019 and December 31, 2018 (in thousands):



	March 31, 2019			December 31, 2018
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. As a result of the IPO, the interest rate was reduced to prime plus 0.25% per annum	9,000			9,000
Line of credit—interest at prime with accrued interest due monthly; matures September 2020	25,000			—
Total debt	49,000			24,000
Less: unamortized debt discount issuance costs	(77		)	(90		)
Balance	48,923			23,910
Debt, current	(32,569		)	(5,671		)
Debt, noncurrent	$	16,354		$	18,239
Weighted-average interest rate	5.81		%	6.89		%

Under the Company’s Loan and Security Agreement, as amended (the “Loan Agreement”), the aggregate amount of the facility is up to $49.0 million, consisting of an outstanding $15.0 million term loan (the “First Term Loan”), an outstanding $9.0 million term loan (the “Second Term Loan” and, together with the First Term Loan, the “Term Loans”) and a revolving line of credit, which permits borrowings of up to $25.0 million subject to customary conditions. Among other things, the Company may only borrow funds under the revolving line of credit if, after giving effect thereto, total borrowings under the line of credit do not exceed a specified percentage of eligible trade and client accounts receivable.

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 the prime rate plus 5.25% per annum to the prime rate plus 0.25% per annum, from and after the occurrence of an initial public offering by the Company with net proceeds of more than $50.0 million. This reduction became effective following the completion of the IPO in October 2018.

In March 2019, the Company entered into a third amendment (the “Third Amendment”) to the Loan Agreement, which, among other changes, (i) amended the adjusted quick ratio financial covenant to provide that the Company will maintain an adjusted quick ratio of 1.75 to 1.00 (previously 1.30 to 1.00), (ii) reduced the frequency with which the Company is required to provide certain financial information to the lender during periods in which it maintains an adjusted quick ratio of 2.50 to 1.00, and (iii) eliminated the minimum EBITDA covenant with which the Company was required to comply. The Company was in compliance with its covenants under the Loan Agreement as of March 31, 2019 and December 31, 2018.

To the extent the Company has not yet collected funds for hourly billings from clients that are in-transit due to timing differences in receipt of cash from clients, the Company may utilize the revolving line of credit to satisfy customary escrow funding requirements. In March 2019, the Company drew down $25.0 million under the revolving line of credit for such purpose, which the Company subsequently repaid in April 2019. See Note 14—Subsequent Events.

As of March 31, 2019, the Company had $24.0 million outstanding pursuant to the Term Loans and $25.0 million outstanding under the revolving line of credit. As of December 31, 2018, the Company had $24.0 million outstanding pursuant to the Term Loans and no borrowings outstanding under the revolving line of credit.

Amortization expense related to the debt discount was immaterial for the three months ended March 31, 2019 and 2018.

Redeemable Convertible Preferred Stock	3 Months Ended
Redeemable Convertible Preferred Stock	Mar. 31, 2019
Temporary Equity Disclosure [Abstract]
Redeemable Convertible Preferred Stock	Redeemable Convertible Preferred Stock Prior to the IPO, the Company financed its operations and capital expenditures primarily through sales of convertible preferred stock, bank borrowings, and utilization of cash generated from operations in the periods in which the Company generated cash flows from operations. As a result of the IPO, all of the Company’s 61,279,079 shares of then-outstanding redeemable convertible preferred stock automatically converted into shares of common stock on a one-for-one basis. Therefore, there were no issued or outstanding shares of redeemable convertible preferred stock as of March 31, 2019 and December 31, 2018.

Preferred and Common Stock Warrants	3 Months Ended
Preferred and Common Stock Warrants	Mar. 31, 2019
Equity [Abstract]
Preferred and Common Stock Warrants	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 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. Prior to its IPO, the Company estimated the fair value of its redeemable convertible preferred stock warrant using the Black-Scholes valuation model. The Company recorded $0.3 million related to the revaluation of its redeemable convertible preferred stock warrant liability, which is included in other (income) expense, net in the Company’s condensed consolidated statement of operations for the three months ended March 31, 2018. Upon completion of the IPO, this warrant converted to a common stock warrant exercisable for the same number of shares and was reclassified to additional paid-in capital. The common stock warrant was outstanding and exercisable as of March 31, 2019 and December 31, 2018. In April 2019, this common stock warrant was exercised in full. See Note 14—Subsequent Events. Common Stock Warrant In 2018, the Company established The Upwork Foundation initiative. The program includes 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. The vesting and exercisability provisions of the warrant became effective upon the IPO in October 2018. 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. For the three months ended March 31, 2019, the Company recorded $0.2 million of expense related to the revaluation of this warrant, which is included in general and administrative expense in the Company’s condensed consolidated statement of operations.

Common Stock

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Common Stock

Holders of common stock are entitled to one vote per share and are entitled to receive dividends, if any, on a pro rata basis whenever funds are legally available and when, as, and if declared by the Company’s board of directors.

As of March 31, 2019 and December 31, 2018, the Company was authorized to issue 490,000,000 shares of common stock. As of March 31, 2019 and December 31, 2018, the Company had reserved shares of common stock for future issuance as follows:



	March 31, 2019	December 31, 2018
Options issued and outstanding	23,304,831	23,774,279
RSUs issued and outstanding	1,087,759	288,460
Warrant to purchase common stock	898,331	898,331
Remaining shares reserved for future issuances under 2018 Equity Incentive Plan	15,277,301	10,558,306
Remaining shares reserved for futures issuances under 2018 Employee Stock Purchase Plan	2,551,634	1,700,000
Total	43,119,856	37,219,376

Stock-Based Compensation

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Note 10—Stock-Based Compensation

Equity Incentive Plans

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



	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, 2018	23,774,279		$	3.71	7.10	$	342,262
Exercised	(273,105	)	2.81
Forfeited and canceled	(196,343	)	4.63
Balances at March 31, 2019	23,304,831		$	3.72	6.86	$	359,444

In 2018, the Company’s board of directors and stockholders each adopted the 2018 Equity Incentive Plan (“2018 EIP”), which became effective on the date immediately prior to the date of the IPO. Awards granted under the 2018 EIP may be (i) incentive stock options, (ii) nonqualified stock options, (iii) RSUs, (iv) restricted stock awards, or (v) stock appreciation rights, as determined by the Company’s board of directors at the time of grant.

The following table summarizes the RSU activity and related information under the 2018 EIP:



	Number of RSUs Outstanding		Weighted-Average Grant Date Fair Value
Unvested balance at December 31, 2018	288,460		$	15.00
Granted	825,320		19.34
Vested	(2,332	)	15.00
Forfeited and canceled	(23,689	)	18.85
Unvested balance at March 31, 2019	1,087,759		$	18.21

Pursuant to the terms of the 2018 EIP, in January 2019, the number of shares available for grant was increased by 5,322,716 shares. As of March 31, 2019, 15,277,301 shares were reserved for future issuance under the 2018 EIP.

In July 2018, the Company’s board of directors granted an option exercisable for up to 1,860,000 shares of common stock to the Company’s Chief Executive Officer under the 2018 EIP (the “CEO Award”). The vesting and exercisability of the CEO Award is contingent upon the recipient’s continuous service as the Chief Executive Officer and the achievement of certain measurement objectives during three separate measurement periods within the period of time beginning on January 1, 2019 and ending on December 31, 2023. Each reporting period, the Company assesses the probability that the performance criteria will be met and records expense for those shares that are probable of vesting. For the three months ended March 31, 2019, the Company recorded $0.5 million related to the CEO Award.

In February 2019, the Company’s board of directors approved the omnibus Performance Bonus Plan along with the performance criteria and bonus pool for 2019 (the “Bonus Plan”), which provides for the payment of bonus compensation to selected employees of the Company, including the Company’s executive officers, upon the achievement of certain performance criteria. In lieu of a cash payment, bonus payments to certain of the Company’s management team will be paid in the form of fully vested RSUs issued from the 2018 EIP. The ultimate number of fully vested RSUs to be granted will be determined by dividing (A) the total dollar value of the bonus that would be delivered in cash by (B) the closing stock price on the day prior to the award grant date, which is expected to occur in the first quarter of 2020. The payment of the bonus in fully vested RSUs requires accounting as a stock-based award under U.S. GAAP. Because the number of fully vested RSUs to be granted is dependent upon the future closing price of the Company’s common stock, the Company has classified this award as a liability within its condensed consolidated balance sheet as of March 31, 2019. Each reporting period, the Company assesses the probability that the performance criteria will be met and records expense for those shares that are probable of vesting.

Employee Stock Purchase Plan

In 2018, the Company’s board of directors and stockholders each adopted the 2018 Employee Stock Purchase Plan (“2018 ESPP”), which became effective upon the completion of the IPO. Pursuant to the terms of the 2018 ESPP, in January 2019, the number of shares available for issuance was increased by 851,634 shares. As of March 31, 2019, 2,551,634 shares were reserved for future issuance under the 2018 ESPP.

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 March 31,
	2019		2018
Cost of revenue	$	144	$	52
Research and development	1,380		550
Sales and marketing	642		340
General and administrative	2,129		946
Total stock-based compensation	$	4,295	$	1,888

Net Loss per Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Net Loss per Share

The following table sets forth the computation of the Company’s basic and diluted net loss per share for the periods presented (in thousands, except share and per share data):



	Three Months Ended March 31,
	2019			2018
Numerator:
Net loss	$	(4,728	)	$	(6,784	)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted	106,639,079			34,192,856

Net loss per share, basic and diluted	$	(0.04	)	$	(0.20	)

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



	As of March 31,
	2019	2018
Options to purchase common stock	23,304,831	23,799,710
Common stock issuable upon conversion of redeemable convertible preferred stock	—	61,279,079
Common stock issuable upon exercise of common stock warrants	898,331	45,286
Common stock issuable upon exercise and redeemable conversion of preferred stock warrants	—	398,331
Common stock issuable upon vesting of restricted stock units	1,087,759	—
Total	25,290,921	85,522,406

Segment and Geographical Information

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Segment and Geographical Information

The Company 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 for the periods presented (in thousands):



	Three Months Ended March 31,
	2019		2018
Marketplace	$	60,903	$	51,959
Managed services	8,021		7,259
Total revenue	$	68,924	$	59,218

The Company generates its revenue from freelancers and clients. The following table sets forth total revenue by geographic area based on the billing address of its freelancers and clients for the periods presented (in thousands):



	Three Months Ended March 31,
	2019		2018
Freelancers
United States	$	11,888	$	9,103
India	6,630		6,106
Philippines	4,577		3,955
Rest of world	21,695		19,025
Total freelancers	44,790		38,189
Clients
United States	17,674		15,462
Rest of world	6,460		5,567
Total clients	24,134		21,029
Total revenue	$	68,924	$	59,218

Substantially all of the Company’s long-lived assets were located in the United States as of March 31, 2019 and December 31, 2018.

401(k) Plan	3 Months Ended
401(k) Plan	Mar. 31, 2019
Retirement Benefits [Abstract]
401(k) Plan	401(k) Plan The Company offers the Upwork Retirement Savings Plan (the “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 contribution. The Company makes matching contributions equal to 50% of each dollar contributed, subject to a maximum contribution of $5,000 annually per participant. The Company’s total expense for the matching contributions was $0.9 million and $0.8 million for the three months ended March 31, 2019 and 2018, respectively.

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In April 2019, the Company repaid $25.0 million outstanding under the Company’s line of credit that was drawn down in March in order to satisfy the Company’s escrow funding requirements as of March 31, 2019. Also in April 2019, a warrant to purchase 398,331 shares of the Company’s common stock was exercised in full at a total cost of $1.2 million. In lieu of a cash payment, the holder of the warrant surrendered 64,646 shares to cover the exercise price. The Company issued 333,685 shares as a result of this exercise. In May 2019, the Compensation Committee of the Board of Directors granted 61,760 RSUs to Hayden Brown in connection with her promotion to Chief Marketing and Product Officer. The RSUs vest in equal quarterly installments over 16 quarters of continuous service with the first vesting date to occur June 18, 2019. Each subsequent vest date will occur on the 18th day of the third month of each quarter.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Basis of Presentation

The condensed consolidated financial statements include the accounts of Upwork Inc. and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated.

Use of Estimates

Marketable Securities

Income Taxes

Recent Accounting Pronouncements Not Yet Adopted


•	identification of performance obligations;


•	principal agent considerations;


•	whether costs to obtain a contract with a customer will be capitalized or expensed;


•	timing of revenue recognition; and


•	revenue disclosures which are expected to expand and may require judgment in certain areas.

- 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)

3 Months Ended

Mar. 31, 2019

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 assets measured at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands):



	March 31, 2019
	Level I		Level II		Level III		Total
Cash equivalents
Money market funds	$	32,028	$	—	$	—	$	32,028
Commercial paper	—		3,097		—		3,097
Marketable securities
Commercial paper	—		52,123		—		52,123
Treasury bills	4,960		—		—		4,960
U.S. government securities	14,916		—		—		14,916
Total financial assets	$	51,904	$	55,220	$	—	$	107,124



	December 31, 2018
	Level I		Level II		Level III		Total
Cash equivalents—money market funds	$	117,138	$	—	$	—	$	117,138
Total financial assets	$	117,138	$	—	$	—	$	117,138

Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Cash and Cash Equivalents

Cash and cash equivalents consisted of the following (in thousands):



	March 31, 2019		December 31, 2018
Cash	$	14,095	$	11,990
Money market funds	32,028		117,138
Commercial paper	3,097		—
Total cash and cash equivalents	$	49,220	$	129,128

Marketable Securities

Marketable securities consisted of the following (in thousands):



	March 31, 2019
Commercial paper	$	52,123
Treasury bills	4,960
U.S. government securities	14,916
Total marketable securities	$	71,999

Property and Equipment, Net

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



	March 31, 2019			December 31, 2018
Computer equipment and software	$	3,475		$	3,189
Internal-use software and platform development	7,390			6,287
Leasehold improvements	6,509			5,783
Office furniture and fixtures	2,524			2,545
Total property and equipment	19,898			17,804
Less: accumulated depreciation	(7,294		)	(6,989		)
Property and equipment, net	$	12,604		$	10,815

Intangible Assets, Net



	March 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade names	$	2,293	$	2,293	$	—
User relationships	18,678		13,341		5,337
Developed technology	10,356		10,356		—
Domain names	529		529		—
Total	$	31,856	$	26,519	$	5,337



	December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade names	$	2,293	$	2,293	$	—
User relationships	18,678		12,674		6,004
Developed technology	10,356		10,356		—
Domain names	529		529		—
Total	$	31,856	$	25,852	$	6,004

Estimated Future Amortization Expense for Acquired Intangible Assets

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



	March 31, 2019
Remainder of 2019	$	2,001
2020	2,668
2021	668
Total estimated future amortization expense	$	5,337

Accrued Expenses and Other Current Liabilities

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



	March 31, 2019		December 31, 2018
Accrued compensation and related benefits	$	5,419	$	9,314
Accrued freelancer costs	823		2,465
Accrued indirect taxes	1,888		1,630
Accrued vendor expenses	5,993		6,002
Accrued payment processing fees	811		715
Other	672		822
Total accrued expenses and other current liabilities	$	15,606	$	20,948

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

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

As of March 31, 2019, future aggregate minimum lease payments under the non-cancellable operating leases, net of sublease income, were as follows (in thousands):



	March 31, 2019
Remainder of 2019	$	2,728
2020	5,861
2021	6,342
2022	6,588
2023	6,776
Thereafter	13,137
Less: sublease income	(706		)
Total	$	40,726

Debt (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Summary of Carrying Value of Debt

The following table presents the carrying value of the Company’s debt obligations as of March 31, 2019 and December 31, 2018 (in thousands):



	March 31, 2019			December 31, 2018
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. As a result of the IPO, the interest rate was reduced to prime plus 0.25% per annum	9,000			9,000
Line of credit—interest at prime with accrued interest due monthly; matures September 2020	25,000			—
Total debt	49,000			24,000
Less: unamortized debt discount issuance costs	(77		)	(90		)
Balance	48,923			23,910
Debt, current	(32,569		)	(5,671		)
Debt, noncurrent	$	16,354		$	18,239
Weighted-average interest rate	5.81		%	6.89		%

- 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.

+ References

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+ Details

Common Stock (Tables)

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Summary of Common Stock Shares Reserved for Future Issuance

As of March 31, 2019 and December 31, 2018, the Company had reserved shares of common stock for future issuance as follows:



	March 31, 2019	December 31, 2018
Options issued and outstanding	23,304,831	23,774,279
RSUs issued and outstanding	1,087,759	288,460
Warrant to purchase common stock	898,331	898,331
Remaining shares reserved for future issuances under 2018 Equity Incentive Plan	15,277,301	10,558,306
Remaining shares reserved for futures issuances under 2018 Employee Stock Purchase Plan	2,551,634	1,700,000
Total	43,119,856	37,219,376

- 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.

+ References

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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Activity under Stock Option Plans

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



	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, 2018	23,774,279		$	3.71	7.10	$	342,262
Exercised	(273,105	)	2.81
Forfeited and canceled	(196,343	)	4.63
Balances at March 31, 2019	23,304,831		$	3.72	6.86	$	359,444

Summary of Activity under RSU Plans

The following table summarizes the RSU activity and related information under the 2018 EIP:



	Number of RSUs Outstanding		Weighted-Average Grant Date Fair Value
Unvested balance at December 31, 2018	288,460		$	15.00
Granted	825,320		19.34
Vested	(2,332	)	15.00
Forfeited and canceled	(23,689	)	18.85
Unvested balance at March 31, 2019	1,087,759		$	18.21

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 March 31,
	2019		2018
Cost of revenue	$	144	$	52
Research and development	1,380		550
Sales and marketing	642		340
General and administrative	2,129		946
Total stock-based compensation	$	4,295	$	1,888

Net Loss per Share (Tables)

3 Months Ended

Mar. 31, 2019

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 for the periods presented (in thousands, except share and per share data):



	Three Months Ended March 31,
	2019			2018
Numerator:
Net loss	$	(4,728	)	$	(6,784	)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted	106,639,079			34,192,856

Net loss per share, basic and diluted	$	(0.04	)	$	(0.20	)

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 because including them would have been anti-dilutive:



	As of March 31,
	2019	2018
Options to purchase common stock	23,304,831	23,799,710
Common stock issuable upon conversion of redeemable convertible preferred stock	—	61,279,079
Common stock issuable upon exercise of common stock warrants	898,331	45,286
Common stock issuable upon exercise and redeemable conversion of preferred stock warrants	—	398,331
Common stock issuable upon vesting of restricted stock units	1,087,759	—
Total	25,290,921	85,522,406

Segment and Geographical Information (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Revenue by Type of Service

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



	Three Months Ended March 31,
	2019		2018
Marketplace	$	60,903	$	51,959
Managed services	8,021		7,259
Total revenue	$	68,924	$	59,218

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 for the periods presented (in thousands):



	Three Months Ended March 31,
	2019		2018
Freelancers
United States	$	11,888	$	9,103
India	6,630		6,106
Philippines	4,577		3,955
Rest of world	21,695		19,025
Total freelancers	44,790		38,189
Clients
United States	17,674		15,462
Rest of world	6,460		5,567
Total clients	24,134		21,029
Total revenue	$	68,924	$	59,218

Organization and Description of Business (Details) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2015 platform
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating platforms consolidated \| platform		2
Subsidiary, Sale of Stock [Line Items]
Consideration received on stock transaction \| $	$ 109.4
IPO
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in stock transaction \| shares	7,840,908
Price per share of stock transaction (in dollars per share) \| $ / shares	$ 15.00
Underwriters' Option
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in stock transaction \| shares	1,022,727
Price per share of stock transaction (in dollars per share) \| $ / shares	$ 1.05

Fair Value Measurements - Financial Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	$ 107,124	$ 117,138
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	32,028	117,138
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	3,097
Marketable securities	52,123
Treasury bills
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	4,960
U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	14,916
Level I
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	51,904	117,138
Level I \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	32,028	117,138
Level I \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Marketable securities	0
Level I \| Treasury bills
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	4,960
Level I \| U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	14,916
Level II
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	55,220	0
Level II \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Level II \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	3,097
Marketable securities	52,123
Level II \| Treasury bills
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Level II \| U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Level III
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Level III \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	$ 0
Level III \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Marketable securities	0
Level III \| Treasury bills
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Level III \| U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 0

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other (income) expense, net	$ 479	$ (249)
Redeemable Convertible Preferred Stock Warrant Liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other (income) expense, net		$ (300)

Balance Sheet Components - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Cash	$ 14,095	$ 11,990
Money market funds	32,028	117,138
Commercial paper	3,097	0
Total cash and cash equivalents	$ 49,220	$ 129,128	$ 26,461	$ 21,595

Balance Sheet Components - Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Marketable Securities [Line Items]
Total marketable securities	$ 71,999	$ 0
Commercial paper
Marketable Securities [Line Items]
Total marketable securities	52,123
Treasury bills
Marketable Securities [Line Items]
Total marketable securities	4,960
U.S. government securities
Marketable Securities [Line Items]
Total marketable securities	$ 14,916

Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 19,898		$ 17,804
Less: accumulated depreciation	(7,294)		(6,989)
Property and equipment, net	12,604		10,815
Depreciation expense	800	$ 400
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment	3,475		3,189
Internal-use software and platform development
Property, Plant and Equipment [Line Items]
Total property and equipment	7,390		6,287
Capitalized costs	1,100	$ 600
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	6,509		5,783
Office furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 2,524		$ 2,545

Balance Sheet Components - Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 31,856	$ 31,856
Accumulated Amortization	26,519	25,852
Net Carrying Amount	5,337	6,004
Amortization expense of intangible assets	700
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	13,341	12,674
Net Carrying Amount	$ 5,337	$ 6,004
Remaining useful life	2 years	2 years 3 months
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	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Remainder of 2019	$ 2,001
2020	2,668
2021	668
Net Carrying Amount	$ 5,337	$ 6,004

Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Accrued compensation and related benefits	$ 5,419	$ 9,314
Accrued freelancer costs	823	2,465
Accrued indirect taxes	1,888	1,630
Accrued vendor expenses	5,993	6,002
Accrued payment processing fees	811	715
Other	672	822
Total accrued expenses and other current liabilities	$ 15,606	$ 20,948

Commitments and Contingencies - Operating Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) agreement	Mar. 31, 2018 USD ($)	Dec. 31, 2018 agreement office_space
Lessee, Lease, Description [Line Items]
Number of non-cancellable operating lease agreements \| agreement	5
Lease payment, year 2	$ 5,861
Lease payment, year 3	6,342
Lease payment, year 4	6,588
Lease payment, year 5	6,776
Lease payment, thereafter	13,137
Accelerated depreciation	300
Rent expense	1,200	$ 1,000
Santa Clara
Lessee, Lease, Description [Line Items]
Total minimum lease payments	14,300
Santa Clara \| Minimum
Lessee, Lease, Description [Line Items]
Total minimum lease payments	1,400
Lease payment, year 1	1,400
Lease payment, year 2	1,400
Lease payment, year 3	1,400
Lease payment, year 4	1,400
Lease payment, year 5	1,400
Lease payment, thereafter	1,400
Santa Clara \| Maximum
Lessee, Lease, Description [Line Items]
Total minimum lease payments	1,800
Lease payment, year 1	1,800
Lease payment, year 2	1,800
Lease payment, year 3	1,800
Lease payment, year 4	1,800
Lease payment, year 5	1,800
Lease payment, thereafter	1,800
San Francisco
Lessee, Lease, Description [Line Items]
Total minimum lease payments	15,700
San Francisco \| Minimum
Lessee, Lease, Description [Line Items]
Total minimum lease payments	1,000
Lease payment, year 1	1,000
Lease payment, year 2	1,000
Lease payment, year 3	1,000
Lease payment, year 4	1,000
Lease payment, year 5	1,000
San Francisco \| Maximum
Lessee, Lease, Description [Line Items]
Total minimum lease payments	2,200
Lease payment, year 1	2,200
Lease payment, year 2	2,200
Lease payment, year 3	2,200
Lease payment, year 4	2,200
Lease payment, year 5	2,200
Chicago
Lessee, Lease, Description [Line Items]
Total minimum lease payments	10,300
Number of sublease agreements \| agreement			2
Number of leased spaces \| office_space			2
Chicago \| Minimum
Lessee, Lease, Description [Line Items]
Total minimum lease payments	500
Lease payment, year 1	500
Lease payment, year 2	500
Lease payment, year 3	500
Lease payment, year 4	500
Lease payment, year 5	500
Lease payment, thereafter	500
Chicago \| Maximum
Lessee, Lease, Description [Line Items]
Total minimum lease payments	2,000
Lease payment, year 1	2,000
Lease payment, year 2	2,000
Lease payment, year 3	2,000
Lease payment, year 4	2,000
Lease payment, year 5	2,000
Lease payment, thereafter	$ 2,000

Commitments and Contingencies - Future Aggregate Minimum Lease Payments Under Non-Cancelable Operating Leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2019	$ 2,728
2020	5,861
2021	6,342
2022	6,588
2023	6,776
Thereafter	13,137
Less: sublease income	(706)
Total	$ 40,726

Commitments and Contingencies - Letters of Credit (Details) $ in Millions	Mar. 31, 2019 USD ($) letter	Dec. 31, 2018 USD ($) letter
Commitments and Contingencies Disclosure [Abstract]
Letters Of Credit Held \| letter	4	3
Letters of Credit Outstanding, Amount \| $	$ 1.1	$ 0.8

Debt - Summary of Carrying Value of Debt (Details)	1 Months Ended		3 Months Ended	8 Months Ended
Debt - Summary of Carrying Value of Debt (Details)	Oct. 31, 2018	Sep. 30, 2018 USD ($) installment	Mar. 31, 2019 USD ($) installment	Aug. 31, 2018	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Total debt			$ 49,000,000		$ 24,000,000
Less: unamortized debt discount issuance costs			(77,000)		(90,000)
Balance			48,923,000		23,910,000
Debt, current			(32,569,000)		(5,671,000)
Debt, noncurrent			$ 16,354,000		$ 18,239,000
Weighted-average interest rate			5.81%		6.89%
First Term Loan
Debt Instrument [Line Items]
Total debt			$ 15,000,000		$ 15,000,000
Interest only payments term			18 months
Number of equal monthly installments of principal and interest \| installment			36
First Term Loan \| Prime Rate
Debt Instrument [Line Items]
Debt, variable rate			0.25%
Second Term Loan
Debt Instrument [Line Items]
Total debt			$ 9,000,000		9,000,000
Interest only payments term			11 months
Number of equal monthly installments of principal and interest \| installment		42	47
EBITDA, trailing period		6 months
EBITDA		$ 1,000,000.0
Second Term Loan \| Prime Rate
Debt Instrument [Line Items]
Debt, variable rate	0.25%	5.25%		5.25%
Line of Credit
Debt Instrument [Line Items]
Total debt			$ 25,000,000		$ 0

Debt - Additional Information (Details)	1 Months Ended		3 Months Ended		8 Months Ended	12 Months Ended
Debt - Additional Information (Details)	Oct. 31, 2018	Sep. 30, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Aug. 31, 2018	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 49,000,000.0
Net proceeds		$ 50,000,000
Adjusted quick ratio			1.75			1.30
Adjusted quick ratio to maintain to reduce frequency of providing financial information			2.50
Proceeds from borrowings on debt			$ 25,000,000	$ 0
Outstanding debt			48,923,000			$ 23,910,000
Outstanding line of credit			25,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			25,000,000.0
First Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount			$ 15,000,000.0
First Term Loan \| Prime Rate
Debt Instrument [Line Items]
Debt, variable rate			0.25%
Second Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount			$ 9,000,000.0
Second Term Loan \| Prime Rate
Debt Instrument [Line Items]
Debt, variable rate	0.25%	5.25%			5.25%
Term Loan
Debt Instrument [Line Items]
Outstanding debt			$ 24,000,000			$ 24,000,000

Redeemable Convertible Preferred Stock (Details) - shares	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Temporary Equity Disclosure [Abstract]
Redeemable convertible preferred stock, shares outstanding	0	0	61,279,079	61,279,079
Conversion ratio				100.00%
Redeemable convertible preferred stock, shares issued	0	0

Preferred and Common Stock Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	May 31, 2018
Class of Warrant or Right [Line Items]
Change in fair value of redeemable convertible preferred stock warrant liability	$ 0	$ 318
Change in fair value of Tides Foundation common stock warrant	$ 252	$ 0
Redeemable Convertible Preferred Stock Warrants \| Series A-1 Redeemable Convertible Preferred Stock
Class of Warrant or Right [Line Items]
Number of shares issued upon exercisable of warrants	124,506
Exercise price of warrants (in dollars per share)	$ 3.13
Redeemable Convertible Preferred Stock Warrants \| Series A-2 Redeemable Convertible Preferred Stock
Class of Warrant or Right [Line Items]
Number of shares issued upon exercisable of warrants	273,825
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 (in dollars per share)			$ 0.01

Common Stock - Additional Information (Details) - shares	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Common Stock, voting rights	one vote per share
Common stock, shares authorized	490,000,000	490,000,000

Common Stock - Summary of Common Stock Shares Reserved for Future Issuance (Details) - shares	Mar. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Common stock shares reserved for future issuance	43,119,856	37,219,376
2018 ESPP
Class of Stock [Line Items]
Common stock shares reserved for future issuance	2,551,634	1,700,000
2018 Equity Incentive Plan
Class of Stock [Line Items]
Common stock shares reserved for future issuance	15,277,301	10,558,306
Options issued and outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance	23,304,831	23,774,279
RSUs issued and outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance	1,087,759	288,460
Warrant to purchase common stock
Class of Stock [Line Items]
Common stock shares reserved for future issuance	898,331	898,331

Stock-Based Compensation - Activity under Stock Option Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Number of Shares Underlying Outstanding Options
Balances at beginning of period (in shares)	23,774,279
Exercised (in shares)	(273,105)
Forfeited and canceled (in shares)	(196,343)
Balances at end of period (in shares)	23,304,831	23,774,279
Weighted-Average Exercise Price
Balances at beginning of period (in dollars per share)	$ 3.71
Exercised (in dollars per share)	2.81
Forfeited and canceled (in dollars per share)	4.63
Balances at beginning of period (in dollars per share)	$ 3.72	$ 3.71
Weighted-Average Remaining Contractual Term (Years)	6 years 10 months 10 days	7 years 1 month 6 days
Aggregate Intrinsic Value	$ 359,444	$ 342,262

Stock-Based Compensation - Activity under RSU Plans (Details) - RSUs	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Number of RSUs Outstanding
Unvested Balance at beginning of period (in shares) \| shares	288,460
Granted (in shares) \| shares	825,320
Vested (in shares) \| shares	(2,332)
Forfeited and Canceled (in shares) \| shares	(23,689)
Unvested Balance at end of period (in shares) \| shares	1,087,759
Weighted-Average Grant Date Fair Value
Unvested Balance at beginning of period (in dollars per share) \| $ / shares	$ 15.00
Granted (in dollars per share) \| $ / shares	19.34
Vested (in dollars per share) \| $ / shares	15.00
Forfeited and Canceled (in dollars per share) \| $ / shares	18.85
Unvested Balance at end of period (in dollars per share) \| $ / shares	$ 18.21

Stock-Based Compensation - Equity Incentive Plans, Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Jan. 31, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Jul. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance		43,119,856		37,219,376
Share-based expense		$ 4,295	$ 1,888
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
Share-based expense		$ 500
2018 EIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in number of shares available for issuance	5,322,716
Common stock shares reserved for future issuance		15,277,301		10,558,306

Stock-Based Compensation - Employee Stock Purchase Plan (Details) - shares	1 Months Ended
	Jan. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance		43,119,856	37,219,376
2018 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in number of shares available for issuance	851,634
Common stock shares reserved for future issuance		2,551,634	1,700,000

Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 4,295	$ 1,888
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	144	52
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	1,380	550
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	642	340
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 2,129	$ 946

Net Loss per Share - Summary of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net loss	$ (4,728)	$ (6,784)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	106,639,079	34,192,856
Net loss per share, basic and diluted (in dollars per share)	$ (0.04)	$ (0.20)

- 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 - Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
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	25,290,921	85,522,406
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	23,304,831	23,799,710
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	0	61,279,079
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	898,331	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	0	398,331
Restricted Stock Units
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	1,087,759	0

Segment and Geographical Information - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019 segment
Segment Reporting [Abstract]
Number of operating segments	1
Number of reportable segments	1

Segment and Geographical Information - Revenue by Type of Service (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 68,924	$ 59,218
Marketplace
Disaggregation of Revenue [Line Items]
Revenue	60,903	51,959
Managed services
Disaggregation of Revenue [Line Items]
Revenue	$ 8,021	$ 7,259

Segment and Geographical Information - Revenue by Geographic Area Based on Billing Address of Freelancers and Clients (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 68,924	$ 59,218
Freelancers
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	44,790	38,189
Freelancers \| United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	11,888	9,103
Freelancers \| India
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	6,630	6,106
Freelancers \| Philippines
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	4,577	3,955
Freelancers \| Rest of world
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	21,695	19,025
Clients
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	24,134	21,029
Clients \| United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	17,674	15,462
Clients \| Rest of world
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 6,460	$ 5,567

401(k) Plan (Details) - USD ($)	3 Months Ended
401(k) Plan (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2018
Retirement Benefits [Abstract]
Company matching cash contributions	50.00%
Maximum annual contributions per employee	$ 5,000
Expense for matching contributions	$ 900,000	$ 800,000

Subsequent Events (Details) $ in Millions		1 Months Ended	3 Months Ended
Subsequent Events (Details) $ in Millions	May 08, 2019 quarter shares	Apr. 30, 2019 USD ($) shares	Mar. 31, 2019 shares
RSUs
Subsequent Event [Line Items]
Number of shares granted			825,320
Subsequent Event
Subsequent Event [Line Items]
Repayment of line of credit \| $		$ 25.0
Proceeds from exercise of common stock warrant \| $		$ 1.2
Number of warrants exercised (in shares)		398,331
Number of warrants surrendered (in shares)		64,646
Number of shares issued related to exercise of common stock warrant (in shares)		333,685
Subsequent Event \| RSUs \| Chief Marketing and Product Officer
Subsequent Event [Line Items]
Number of shares granted	61,760
Number of quarters in which the units vest \| quarter	16