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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2018 offering_period shares | Oct. 31, 2017 shares | Aug. 31, 2014 shares | Jun. 30, 2014 shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Jul. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock shares reserved for future issuance (in shares) | shares |  |  |  |  | 37,219,376 | 89,292,466 |  |
Dividend yield |  |  |  |  | 0.00% |  |  |
Intrinsic value of options exercised |  |  |  |  | $ 18,000 | $ 2,900 | $ 600 |
Weighted-average grant-date fair value of options granted (in dollars per share) | $ / shares |  |  |  |  | $ 3.65 | $ 1.54 | $ 1.41 |
Total |  |  |  |  | $ 10,361 | $ 6,846 | $ 7,266 |
Issuance of common stock in connection with the initial public offering, net of discounts and commissions |  |  |  |  | $ 109,381 |  |  |
Nonemployee shares granted (in shares) | shares |  |  |  |  |  | 8,500 | 8,000 |
Stock-based compensation expense related to non-employee services |  |  |  |  |  | $ 100 | $ 200 |
Secondary Market Transactions |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total |  |  |  |  |  | $ 400 | $ 500 |
Number of shares issued and sold (in shares) | shares |  |  |  |  |  | 488,484 | 324,826 |
Issuance of common stock in connection with the initial public offering, net of discounts and commissions |  |  |  |  |  | $ 2,300 | $ 1,600 |
Secondary Market Transactions | Average |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Average share price (in dollars per share) | $ / shares |  |  |  |  |  | $ 4.72 | $ 4.93 |
Options to purchase common stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock shares reserved for future issuance (in shares) | shares |  |  |  |  | 23,774,279 | 23,607,746 |  |
Total |  |  |  |  | $ 8,600 | $ 6,300 | $ 6,500 |
RSUs issued and outstanding |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock shares reserved for future issuance (in shares) | shares |  |  |  |  | 288,460 | 0 |  |
Fully vested non-option equity instruments granted (in shares) | shares |  |  |  |  | 35,494 |  |  |
Value of equity granted |  |  |  |  | $ 500 |  |  |
Share-based tax liability of granted shares |  |  |  |  | $ 200 |  |  |
Shares surrendered to pay for tax liability | shares |  |  |  |  | 12,648 |  |  |
Total |  |  |  |  |  | $ 1,100 |  |
ESPP Plan shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  | $ 600 |
Elance-oDesk Assumed Award Plans |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Discount on share at purchase date from original option price |  |  |  |  | 16.14% |  |  |
Vesting period |  |  |  |  | 4 years |  |  |
Expiration period |  |  |  |  | 10 years |  |  |
2014 Equity Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |  |  |
Expiration period |  |  |  | 10 years |  |  |  |
Shares available for grant | shares |  |  |  | 12,462,985 |  |  |  |
Shares issued in period | shares | 100,000 | 4,500,000 | 3,001,091 |  |  |  |  |
Grant price, threshold of fair value price must meet |  |  |  | 100.00% |  |  |  |
Common stock shares reserved for future issuance (in shares) | shares |  |  |  |  | 0 | 3,962,024 |  |
2018 Equity Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock shares reserved for future issuance (in shares) | shares | 10,701,505 |  |  |  | 10,558,306 | 0 |  |
Option to purchase shares of common stock, granted | shares |  |  |  |  |  |  |  | 1,860,000
Dividend yield |  |  |  |  | 0.00% | 0.00% | 0.00% |
2018 Equity Incentive Plan | Options to purchase common stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized stock-based compensation cost, options |  |  |  |  | $ 23,000 |  |  |
Unrecognized stock-based compensation cost, weighted average period of recognition |  |  |  |  | 3 years 6 months |  |  |
2018 Equity Incentive Plan | RSUs issued and outstanding |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized stock-based compensation cost, options |  |  |  |  | $ 3,800 |  |  |
Unrecognized stock-based compensation cost, weighted average period of recognition |  |  |  |  | 3 years |  |  |
2018 Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Discount on share at purchase date from original option price | 15.00% |  |  |  |  |  |  |
Common stock shares reserved for future issuance (in shares) | shares | 1,700,000 |  |  |  | 1,700,000 | 0 |  |
Dividend yield |  |  |  |  | 0.00% |  |  |
Unrecognized stock-based compensation cost, options |  |  |  |  | $ 1,300 |  |  |
Initial offering period of ESPP | 24 months |  |  |  |  |  |  |
Number of offering periods in ESPP | offering_period | 4 |  |  |  |  |  |  |
Length of offering period | 6 months |  |  |  |  |  |  |
Common stock percentage of purchase price | 85.00% |  |  |  |  |  |  |

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