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Equity Incentive Plans (Tables) | 3 Months Ended
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Mar. 31, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Changes in Shares Available for Grant | Changes in shares available for grant during the three months ended March 31, 2022 were as follows:
|  | Shares Available for Grant |
Shares available for grant at December 31, 2021 |  |  | 22,299,923 |
Stock options and restricted stock units granted and the maximum market-based restricted stock units granted eligible to be earned |  |  | (9,178,494 | )
Stock options and restricted stock units forfeited, cancelled or expired |  |  | 1,378,610 |
Shares available for grant at March 31, 2022 |  |  | 14,500,039 |
Summary of Stock Option Activity Under 2009 Plan and 2019 Plan | Stock option activity under the 2009 Plan and 2019 Plan during the three months ended March 31, 2022 was as follows:
|  | Shares Subject to Outstanding Stock Options |  |  | Weighted-Average Exercise Price per Share |  |  | Aggregate Intrinsic Value (in thousands) |
Stock options outstanding at December 31, 2021 |  |  | 12,778,984 |  |  | $ | 19.72 |  |  |  |  |
Stock options granted |  |  | 3,730,851 |  |  |  | 12.43 |  |  |  |  |
Stock options forfeited or cancelled |  |  | (795,626 | ) |  |  | 29.00 |  |  |  |  |
Stock options expired |  |  | (50,073 | ) |  |  | 34.73 |  |  |  |  |
Stock options exercised |  |  | (648,208 | ) |  |  | 4.22 |  |  |  |  |
Stock options outstanding at March 31, 2022 |  |  | 15,015,928 |  |  | $ | 18.03 |  |  | $ | 51,641 |
Stock options vested and exercisable at March 31, 2022 |  | 7,387,511 |  |  | $ | 13.42 |  |  | $ | 42,129 |
Summary of Restricted Stock Unit Activity | Restricted stock unit activity under the 2019 Plan during the three months ended March 31, 2022 was as follows:
|  | Restricted Stock Units Outstanding |  |  | Weighted-Average Grant Date Fair Value per Share |
Nonvested restricted stock units outstanding at December 31, 2021 |  |  | 1,211,191 |  |  | $ | 37.41 |
Restricted stock units granted |  |  | 4,953,409 |  |  |  | 12.17 |
Restricted stock units forfeited or cancelled |  |  | (532,911 | ) |  |  | 17.37 |
Restricted stock units vested |  |  | (141,185 | ) |  |  | 44.57 |
Nonvested restricted stock units outstanding at March 31, 2022 |  |  | 5,490,504 |  |  | $ | 16.40 |
Summary of Estimated Grant Date Fair Value of Stock Options Granted | The estimated grant date fair values of stock options granted during the three months ended March 31, 2022 and 2021 were estimated using the Black-Scholes option-pricing model with the following assumptions:
|  | Three Months Ended March 31, |
|  | 2022 |  |  | 2021 |
Fair value of common stock |  | $12.14 - $14.95 |  |  | $43.68 - $66.50 |
Expected term (in years) |  | 5.27 - 6.08 |  |  | 5.27 - 6.08 |
Risk-free interest rate |  | 1.7% - 2.5% |  |  | 0.5% - 1.1% |
Expected volatility |  | 68.2% - 69.8% |  |  | 67.1% - 68.4% |
Expected dividend yield |  |  | — |  |  |  | — |
Summary of Compensation Costs Related to Stock Options and RSUs Included on Unaudited Condensed Consolidated Statements of Operations | The compensation cost related to stock options, restricted stock units and market-based restricted stock units for the three months ended March 31, 2022 and 2021 are included on the unaudited condensed consolidated statements of operations as follows (in thousands):
|  | Three Months Ended March 31, |
|  | 2022 |  |  | 2021 |
Cost of revenue |  | $ | 795 |  |  | $ | 328 |
Research and development |  |  | 4,345 |  |  |  | 2,883 |
Sales and marketing |  |  | 3,229 |  |  |  | 2,495 |
General and administrative |  |  | 4,492 |  |  |  | 2,778 |
Total share-based compensation expense |  | $ | 12,861 |  |  | $ | 8,484 |
Schedule of Unrecognized Share-Based Compensation Expense and the Remaining Weighted-Average Recognition Period | As of March 31, 2022, unrecognized share-based compensation expense and the remaining weighted-average recognition period were as follows:
|  | Unrecognized Share-Based Compensation Expense (in thousands) |  |  | Remaining Weighted-Average Recognition Period (in years) |
Nonvested stock options |  | $ | 102,285 |  |  |  | 3.02 |
Nonvested restricted stock units |  |  | 85,458 |  |  |  | 3.63 |
Nonvested market-based restricted stock units |  |  | 4,553 |  |  |  | 2.93 |

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