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Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Activity | The following is a summary of the stock option activity for all stock‑based compensation plans during the year ended December 31, 2019:
|  | Common Stock |  |  | Weighted- Average Exercise Price for Equity |  |  | Weighted- Average Remaining Contractual Life (In Years) |  |  | Aggregate Intrinsic Value(1) |
Outstanding, December 31, 2018 |  |  | 1,807,515 |  |  | $ | 2.35 |  |  | 5.9 |  |  | $ | 56,716 |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (838,928 | ) |  | 2.16 |  |  |  |  |  |  |  | 28,902 |
Forfeited and cancelled |  |  | (25,702 | ) |  | 5.09 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2019 |  |  | 942,885 |  |  | $ | 2.45 |  |  |  | 5.0 |  |  | $ | 30,859 |
Options exercisable at December 31, 2019 |  |  | 913,197 |  |  | $ | 2.31 |  |  |  | 5.0 |  |  | $ | 30,016 |
(1) | The aggregate intrinsic value as of December 31, 2019 and 2018 was calculated based on the positive difference, if any, between the estimated fair value of our common stock on December 31, 2019 and 2018, respectively, or the date of exercise, as appropriate, and the exercise price of the underlying options.
Summary of Restricted Stock Unit Activity | The following is a summary of the RSU activity during the year ended December 31, 2019:
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value |
Unvested outstanding, December 31, 2018 |  |  | 2,973,002 |  |  | $ | 26.06 |  |  | $ | 100,279 |
Granted |  |  | 1,811,208 |  |  |  | 39.07 |  |  |  |  |
Vested |  |  | (1,317,736 | ) |  |  | 23.93 |  |  |  |  |
Forfeited |  |  | (383,173 | ) |  |  | 31.70 |  |  |  |  |
Unvested outstanding, December 31, 2019 |  |  | 3,083,301 |  |  | $ | 33.89 |  |  | $ | 108,471 |
Summary of Stock-based Compensation Expense by Award Type |
|  | Year Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Options |  | $ | 155 |  |  | $ | 247 |  |  | $ | 281 |
RSUs |  |  | 34,146 |  |  |  | 20,547 |  |  |  | 4,747 |
Total stock-based compensation expense |  | $ | 34,301 |  |  | $ | 20,794 |  |  | $ | 5,028 |
Summary of Allocation of Stock-based Compensation Expense |
|  | Year Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Cost of revenue |  | $ | 354 |  |  | $ | 354 |  |  | $ | 151 |
Sales and marketing expense |  |  | 9,989 |  |  |  | 5,111 |  |  |  | 1,911 |
Product, technology, and development expense |  |  | 15,159 |  |  |  | 9,865 |  |  |  | 1,637 |
General and administrative expense |  |  | 8,799 |  |  |  | 5,464 |  |  |  | 1,329 |
Total stock-based compensation expense |  | $ | 34,301 |  |  | $ | 20,794 |  |  | $ | 5,028 |
Summary of Shares of Common Stock Reserved for Future Issuance | At December 31, 2019, the Company had reserved the following shares of voting common stock for future issuance:
Common stock options outstanding |  |  | 942,885 |
Restricted stock units outstanding |  |  | 3,083,301 |
Shares available for issuance under the 2017 Plan |  |  | 5,889,929 |
Total shares of authorized common stock reserved for future issuance |  |  | 9,916,115 |

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