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Equity Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Changes in Shares Available for Grant | Changes in shares available for grant during the year ended December 31, 2021 were as follows:
|  | Shares Available for Grant |
Shares available for grant at December 31, 2020 |  |  | 18,617,001 |
2019 Equity Incentive Plan reserve increase effective January 1, 2021 |  |  | 6,882,344 |
Options and restricted stock units granted |  |  | (4,306,265 | )
Options and restricted stock units forfeited, cancelled or expired |  |  | 1,106,843 |
Shares available for grant at December 31, 2021 |  |  | 22,299,923 |
Summary of Stock Option Activity Under 2008 Plan 2009 Plan and 2019 Plan | Stock option activity under the 2009 Plan and 2019 Plan during the year ended December 31, 2021 was as follows:
|  | Shares Subject to Outstanding Options |  |  | Weighted-Average Exercise Price per Share |  |  | Aggregate Intrinsic Value (in thousands) |
Options outstanding at December 31, 2020 |  |  | 14,433,560 |  |  | $ | 12.82 |  |  |  |  |
Options granted |  |  | 3,052,025 |  |  |  | 39.39 |  |  |  |  |
Options forfeited or cancelled |  |  | (992,428 | ) |  |  | 25.90 |  |  |  |  |
Options expired |  |  | (40,116 | ) |  |  | 26.56 |  |  |  |  |
Options exercised |  |  | (3,674,057 | ) |  |  | 7.21 |  |  |  |  |
Options outstanding at December 31, 2021 |  |  | 12,778,984 |  |  | $ | 19.72 |  |  | $ | 156,105 |
Options vested and exercisable at December 31, 2021 |  | 7,281,600 |  |  | $ | 10.99 |  |  | $ | 132,537 |
Summary of Restricted Stock Unit Activity | Restricted stock unit activity under the 2019 Plan during the year ended December 31, 2021 was as follows:
|  | Restricted Stock Units Outstanding |  |  | Weighted-Average Grant Date Fair Value per Share |
Nonvested outstanding restricted stock units at December 31, 2020 |  |  | 50,000 |  |  | $ | 28.10 |
Restricted stock units granted |  |  | 1,254,240 |  |  |  | 37.98 |
Restricted stock units forfeited or cancelled |  |  | (74,299 | ) |  |  | 43.20 |
Restricted stock units vested |  |  | (18,750 | ) |  |  | 28.10 |
Nonvested outstanding restricted stock units at December 31, 2021 |  |  | 1,211,191 |  |  | $ | 37.41 |
Summary of Estimated Grant Date Fair Values of Options Granted | The estimated grant date fair values of options granted during the years ended December 31, 2021, 2020 and 2019 were estimated using the Black-Scholes option-pricing model with the following assumptions:
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Fair value of common stock |  | $30.86 - $66.50 |  |  | $17.68 - $55.23 |  |  | $7.80 - $47.81 |
Expected term (in years) |  | 5.27 - 6.08 |  |  | 5.27 - 6.08 |  |  | 5.27 - 6.08 |
Risk-free interest rate |  | 0.5% - 1.4% |  |  | 0.4% - 1.7% |  |  | 1.4% - 2.5% |
Expected volatility |  | 67.1% - 70.0% |  |  | 70.5% - 73.3% |  |  | 64.3% - 72.9% |
Expected dividend yield |  |  | — |  |  |  | — |  |  |  | — |
Summary of Compensation Costs Related to Stock Options and RSUs Included on Statements of Operations | The compensation costs related to stock options and restricted stock units for the years ended December 31, 2021, 2020 and 2019 are included on our consolidated statements of operations as follows (in thousands):
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Cost of revenue |  | $ | 2,100 |  |  | $ | 817 |  |  | $ | 555 |
Research and development |  |  | 14,061 |  |  |  | 8,519 |  |  |  | 3,934 |
Sales and marketing |  |  | 12,312 |  |  |  | 6,627 |  |  |  | 3,480 |
General and administrative |  |  | 14,778 |  |  |  | 8,798 |  |  |  | 5,155 |
Total share-based compensation expense |  | $ | 43,251 |  |  | $ | 24,761 |  |  | $ | 13,124 |

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