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Stock-based Compensation (Tables) | 12 Months Ended
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Jan. 31, 2022
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-Based Compensation Expense | The following table summarizes stock-based compensation expense recognized related to awards granted to employees and nonemployees, as follows:
| Year Ended January 31,
(in thousands) | 2022 |  | 2021 |  | 2020
Cost of revenue | $ | 2,257 |  |  | $ | 843 |  |  | $ | 788 |
Research and development | 16,629 |  |  | 4,109 |  |  | 2,754 |
Sales and marketing | 7,877 |  |  | 1,687 |  |  | 1,234 |
General and administrative | 16,422 |  |  | 7,899 |  |  | 1,252 |
Total expense | 43,185 |  |  | 14,538 |  |  | 6,028 |
Capitalized to internal-use software development costs and property and equipment | (1,229) |  |  | (526) |  |  | (957) |
Total stock-based compensation expense | $ | 41,956 |  |  | $ | 14,012 |  |  | $ | 5,071 |
Summary of Stock Option Activity | A summary of stock option activity is as follows:
| Options Outstanding
| Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Term (Years) |  | Aggregate Intrinsic Value (in thousands)
Balances at February 1, 2019 | 24,025,493 |  |  | $ | 2.23 |  |  | 7.07 |  |
Exercised | (171,428) |  |  | 1.54 |  |  |  |  |
Granted | 10,533,973 |  |  | 3.92 |  |  |  |  |
Forfeited | (3,607,656) |  |  | 3.07 |  |  |  |  |
Balances at January 31, 2020 | 30,780,382 |  |  | 2.72 |  |  | 7.13 |  |
Exercised | (1,670,778) |  |  | 0.32 |  |  |  |  |
Granted | 12,255,668 |  |  | 4.04 |  |  |  |  |
Forfeited | (2,118,576) |  |  | 3.56 |  |  |  |  |
Balances at January 31, 2021 | 39,246,696 |  |  | 3.19 |  |  | 7.21 |  |
Exercised(1) | (6,199,287) |  |  | 4.61 |  |  |  |  |
Granted | 12,189,367 |  |  | 9.09 |  |  |  |  |
Forfeited | (3,329,225) |  |  | 3.94 |  |  |  |  |
Balances at January 31, 2022 | 41,907,551 |  |  | $ | 4.63 |  |  | 6.71 |  | $ | 92,370 |
Vested and exercisable at January 31, 2022 | 25,718,277 |  |  | $ | 3.16 |  |  | 5.38 |  | $ | 77,069 |
__________________ (1)Includes 1,838,207 shares of Class A common stock issued upon the early exercise of unvested stock options that are subject to repurchase as described further below.
Summary of Stock Options Outstanding and Exercisable by Price | A summary of options outstanding and exercisable by price at January 31, 2022 are as follows:
| Options Outstanding |  | Options Exercisable
Exercise Price | Number of Options |  | Weighted Average Remaining Contractual Life (in Years) |  | Number of Options |  | Weighted Average Remaining Contractual Life (in Years)
$0.070 | 440,278 |  |  | 1.61 |  | 440,278 |  |  | 1.61
0.559 | 2,638,214 |  |  | 1.95 |  | 2,638,214 |  |  | 1.95
1.807 | 1,942,032 |  |  | 2.56 |  | 1,942,032 |  |  | 2.56
2.026 | 1,883,699 |  |  | 3.62 |  | 1,883,699 |  |  | 3.62
2.325 | 2,312,701 |  |  | 3.09 |  | 2,312,701 |  |  | 3.09
3.417 | 290,425 |  |  | 4.47 |  | 290,425 |  |  | 4.47
3.689 | 2,948,823 |  |  | 4.72 |  | 2,948,823 |  |  | 4.72
3.817 | 1,709,190 |  |  | 6.31 |  | 1,522,935 |  |  | 6.27
3.921 | 7,089,893 |  |  | 7.04 |  | 4,590,629 |  |  | 6.79
4.041 | 10,538,829 |  |  | 8.17 |  | 6,553,005 |  |  | 7.97
5.249 | 1,663,103 |  |  | 9.04 |  | 226,986 |  |  | 8.76
9.753 | 8,450,364 |  |  | 9.41 |  | 368,550 |  |  | 9.41
| 41,907,551 |  |  |  |  | 25,718,277 |  |  |
Schedule of Stock Options, Valuation Assumptions | The fair value of the employee stock options granted during the fiscal years ended January 31, 2022, 2021 and 2020 was estimated using the following assumptions:
| Year Ended January 31,
| 2022 |  | 2021 |  | 2020
Weighted-average expected term (years) | 2.62 - 7.32 |  | 5.02 - 6.76 |  | 5.08 - 6.83
Expected volatility | 42.45% - 48.39% |  | 42.45% - 44.71% |  | 38.13% - 39.85%
Risk-free interest rate | 0.37% - 1.23% |  | 0.31% - 0.52% |  | 1.67% - 2.54%
Dividend yield | 0.00% |  | 0.00% |  | 0.00%
Summary of Restricted Stock Unit ("RSU") Activity | A summary of RSU activity is as follows:
| Number of RSUs |  | Weighted Average Grant Date Fair Value
Balances at February 1, 2019 | 1,230,726 |  |  | $ | 3.91 |
Vested | — |  |  | — |
Granted | 899,956 |  |  | 3.99 |
Forfeited | (689,328) |  |  | 3.94 |
Balances at January 31, 2020 | 1,441,354 |  |  | $ | 3.94 |
Vested | — |  |  | — |
Granted | 306,368 |  |  | 4.22 |
Forfeited | (84,723) |  |  | 3.91 |
Balances at January 31, 2021 | 1,662,999 |  |  | $ | 3.98 |
Vested | (1,425,209) |  |  | 4.75 |
Granted | 5,519,278 |  |  | 9.66 |
Forfeited | (317,332) |  |  | 5.89 |
Balances at January 31, 2022 | 5,439,736 |  |  | $ | 9.42 |

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