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Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-based Awards | The following table summarizes the stock options activity under the 2010 Plan and 2019 Plan for the three months ended March 31, 2020:
| Stock Options Outstanding |  |  |  |  |  |
| (in thousands, except year and per share data) |  |  |  |  |  |
| Shares Subject to Options Outstanding |  | Weighted- Average Exercise Price per Option |  | Weighted- Average Remaining Contractual Terms (in years) |  | Aggregate Intrinsic Value
Balances as of December 31, 2019 | 21,191 |  |  | $ | 2.30 |  |  | 7.4 |  | $ | 312,720 |
Options granted | 1,700 |  |  | $ | 17.93 |  |  |  |  |
Options exercised | (1,518) |  |  | $ | 1.78 |  |  |  |  | $ | 26,551 |
Options canceled/forfeited/expired | (104) |  |  | $ | 2.45 |  |  |  |  |
Balances as of March 31, 2020 | 21,269 |  |  | $ | 3.59 |  |  | 7.5 |  | $ | 422,728 |
Vested and expected to vest as of March 31, 2020 | 21,269 |  |  | $ | 3.59 |  |  | 7.5 |  | $ | 422,728 |
Exercisable as of March 31, 2020 | 19,566 |  |  | $ | 2.34 |  |  | 7.3 |  | $ | 413,239 |
Schedule of Assumptions Used to Determine the Fair Value of Stock Options Granted | The weighted-average assumptions used to determine the fair value of stock options granted during the periods presented were as follows:
| Three Months ended March 31, |  |
| 2020 |  | 2019
Expected term (in years) | 6.1 |  | 6.3
Expected volatility | 40.0 | % |  | 40.3 | %
Risk-free interest rate | 1.5 | % |  | 2.6 | %
Dividend yield | — |  |  | — |
Schedule of Restricted Stock Units Activity | RSU activity for the three months ended March 31, 2020 was as follows:
| Restricted Stock and RSUs |  | Weighted-Average Grant Date Fair Value
| (in thousands, except per share data) |  |
Unvested and outstanding as of December 31, 2019 | 6,508 |  |  | $ | 11.08 |
Granted - RSUs | 1,103 |  |  | $ | 17.93 |
Granted - Restricted stock | 841 |  |  | $ | 17.06 |
Vested - RSUs | (494) |  |  | $ | 9.66 |
Forfeited | (142) |  |  | $ | 10.28 |
Unvested as of March 31, 2020 | 7,816 |  |  | $ | 11.85 |
Vested and not yet released | 7 |  |  | $ | 8.75 |
Outstanding as of March 31, 2020 | 7,823 |  |  | $ | 11.85 |
Schedule of Fair Value Assumptions for Employee Stock Purchase Plan | The weighted-average assumptions used to determine the fair value of the ESPP during the periods presented were as follows:
| Three Months ended March 31, |  |
| 2020 |  | 2019
Expected term (in years) | 0.6 |  | N/A
Risk-free interest rate | 1.8 | % |  | N/A
Expected volatility | 35.5 | % |  | N/A
Dividend yield | — |  |  | N/A
Schedule of Stock-based Compensation Expense | The following table sets forth the total stock-based compensation expense included in the Company’s condensed consolidated statements of operations:
| Three Months Ended March 31, |  |  |  |  |  |  |  |
| 2020 |  | 2019 |  |  |  |  |  |
| (in thousands) |  |  |  |  |  |  |  |
Cost of revenue | $ | 267 |  |  | $ | 32 |  |  |  |  |  |  |
Sales and marketing | 3,163 |  |  | 279 |  |  |  |  |  |  |
Research and development | 6,090 |  |  | 417 |  |  |  |  |  |  |
General and administrative | 3,377 |  |  | 329 |  |  |  |  |  |  |
Total stock-based compensation expense | $ | 12,897 |  |  | $ | 1,057 |  |  |  |  |  |  |

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