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Stockholders' Equity (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2022
Summary of Time-Based RSUs Activity |
|  |  | Weighted average
| Number |  | grant date
| of shares |  | fair value
Outstanding at December 31, 2021 | 7,392 |  | $ | 19.78
Granted | 3,650 |  |  | 11.36
Vested | (1,845) |  |  | 14.69
Forfeited | (322) |  |  | 22.50
Outstanding at March 31, 2022 | 8,875 |  | $ | 17.28
Schedule of Stock-Based Compensation Expense |
| Three Months Ended March 31,
| 2022 |  | 2021
Cost of revenue | $ | 1,758 |  | $ | 992
Research and development |  | 8,965 |  |  | 3,048
Sales, general and administrative |  | 11,980 |  |  | 6,125
Total stock-based compensation expense | $ | 22,703 |  | $ | 10,165
Schedule of Fair Value of Employee Stock Purchase Plan |
|  | Three Months Ended March 31,
|  | 2022 |  | 2021
Expected term in years |  |  | 0.5 - 2.0 |  |  | 0.5 - 2.0
Expected volatility |  |  | 70% |  |  | 68%
Risk-free interest rate |  |  | 0.60% - 1.31% |  |  | 0.07% - 0.13%
Dividend yield |  |  | — |  |  | —
Weighted average grant date fair value per share |  | $ | 5.42 |  | $ | 29.26
Time-based stock options [Member] |
Summary of Stock Option Activity |
|  | Stock Options Outstanding
|  |  |  |  |  |  | Weighted
|  | Number |  |  |  |  | average
|  | of shares |  | Exercise price |  | exercise price
Outstanding at December 31, 2021 |  | 12,159 |  | $ | 1.16 – 46.37 |  | $ | 11.38
Granted |  | 3,798 |  |  | 10.18 – 16.58 |  |  | 11.76
Exercised |  | (178) |  |  | 1.16 – 8.90 |  |  | 3.38
Canceled |  | (232) |  |  | 2.47 – 46.37 |  |  | 27.74
Outstanding at March 31, 2022 |  | 15,547 |  | $ | 1.16 – 46.37 |  | $ | 11.32
Performance-based stock options [Member] |
Summary of Stock Option Activity |
|  | Stock Options Outstanding
|  |  |  |  |  |  | Weighted
|  | Number |  |  |  |  | average
|  | of shares |  | Exercise price |  | exercise price
Outstanding at December 31, 2021 |  | 304 |  | $ | 4.71 - 4.90 |  | $ | 4.71
Granted |  | — |  |  | — |  |  | —
Exercised |  | — |  |  | — |  |  | —
Canceled |  | — |  |  | — |  |  | —
Outstanding at March 31, 2022 |  | 304 |  | $ | 4.71 - 4.90 |  | $ | 4.71

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