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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2021
Stockholders' Equity [Abstract] |
Summary of Stock Option Activity |
|  | Stock Options Outstanding
|  |  |  |  |  |  | Weighted
|  | Number |  |  |  |  | average
|  | of shares |  | Exercise price |  | exercise price
Outstanding at December 31, 2020 |  | 14,638 |  | $ | 1.16 – 20.90 |  | $ | 5.53
Granted |  | 2,229 |  |  | 23.39 – 46.37 |  |  | 34.68
Exercised |  | (4,058) |  |  | 1.16 – 15.98 |  |  | 5.49
Canceled |  | (474) |  |  | 2.54 – 46.37 |  |  | 4.68
Outstanding at June 30, 2021 |  | 12,335 |  | $ | 1.16 – 46.37 |  | $ | 10.84
Summary of Time-Based RSUs Activity |
|  |  | Weighted average
| Number |  | grant date
| of shares |  | fair value
Outstanding at December 31, 2020 | 5,919 |  | $ | 5.25
Granted | 2,579 |  |  | 39.62
Released | (1,489) |  |  | 4.39
Forfeited | (189) |  |  | 12.47
Outstanding at June 30, 2021 | 6,820 |  | $ | 18.23
Summary of Performance-Based RSUs Activity |
|  |  | Weighted average
| Number |  | grant date
| of shares |  | fair value
Outstanding at December 31, 2020 | 94 |  | $ | 2.63
Granted | — |  |  | —
Released | — |  |  | —
Forfeited | (94) |  |  | 2.63
Outstanding at June 30, 2021 | — |  | $ | —
Schedule of Stock-Based Compensation Expense |
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Cost of revenue | $ | 1,906 |  | $ | 452 |  | $ | 2,898 |  | $ | 979
Research and development |  | 4,310 |  |  | 1,433 |  |  | 7,357 |  |  | 3,192
Sales, general and administrative |  | 9,589 |  |  | 1,349 |  |  | 15,715 |  |  | 3,095
Total stock-based compensation expense | $ | 15,805 |  | $ | 3,234 |  | $ | 25,970 |  | $ | 7,266
Schedule of Fair Value of Employee Stock Options |
| Three Months Ended June 30, |  | Six Months Ended June 30,
Stock Option | 2021 |  | 2020 |  | 2021 |  | 2020
Expected term in years | 4.6 |  | — |  | 4.6 |  | 5.1
Expected volatility | 70% |  | — |  | 68% - 70% |  | 57%
Risk-free interest rate | 0.74% |  | — |  | 0.50% - 0.74% |  | 1.20%
Dividend yield | — |  | — |  | — |  | —
Weighted average grant date fair value per share | $14.54 |  | — |  | $18.86 |  | $1.22
Schedule of Fair Value of Employee Stock Purchase Plan |
| Six Months Ended June 30,
ESPP | 2021 |  | 2020
Expected term in years | 0.5 - 2.0 |  | 0.5 - 2.0
Expected volatility | 68% |  | 57%
Risk-free interest rate | 0.07% - 0.13% |  | 0.8% - 1.0%
Dividend yield | — |  | —
Weighted average fair value per share | $29.26 |  | $1.62

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