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Preferred and Common Stock Warrants | 12 Months Ended
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Dec. 31, 2018
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 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 for cash. 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 December 31, 2016 and 2017. Upon completion of the Company’s IPO in October 2018, this warrant converted to a common stock warrant for the same number of shares and was reclassified to additional paid-in capital as of December 31, 2018. Prior to the IPO, 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 $7.2 million as of the date of the IPO and $1.1 million as of December 31, 2017 and 2016. The following assumptions were used to calculate the estimated fair value of the then-outstanding warrants until the closing date of the Company’s IPO and as of December 31, 2017 and 2016:
|  | 2017 |  | 2016
Dividend yield |  | 0 | % |  | 0 | %
Expected term (in years) |  | 2.75 |  |  | 0.50 - 3.75 |
Risk-free interest rates |  | 1.8 | % |  | 1.0% - 1.6% |
Expected volatility |  | 34.6 | % |  | 34.8% - 39.2% |
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 common stock at an exercise price of $0.06 per share. The warrant was outstanding and exercisable as of December 31, 2016 and 2017 with the fair value of the warrant reflected in additional paid-in capital in the 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. The vesting and exercisability provisions of the warrant became effective upon the Company’s 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 year ended December 31, 2018, 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 consolidated statement of operations.

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- Definition Preferred and common stock warrants. + References No definition available. + Details
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