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Stock-based Compensation (Tables)
 12 Months Ended
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)202220212020
Cost of revenue$2,257 $843 $788 
Research and development16,629 4,109 2,754 
Sales and marketing7,877 1,687 1,234 
General and administrative16,422 7,899 1,252 
Total expense43,185 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 
Granted10,533,973 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 
Granted12,255,668 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 
Granted12,189,367 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 
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(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 PriceNumber of
Options		 Weighted
Average
Remaining
Contractual
Life (in Years)		 Number of
Options		 Weighted
Average
Remaining
Contractual
Life (in Years)
$0.070440,278 1.61440,278 1.61
0.5592,638,214 1.952,638,214 1.95
1.8071,942,032 2.561,942,032 2.56
2.0261,883,699 3.621,883,699 3.62
2.3252,312,701 3.092,312,701 3.09
3.417290,425 4.47290,425 4.47
3.6892,948,823 4.722,948,823 4.72
3.8171,709,190 6.311,522,935 6.27
3.9217,089,893 7.044,590,629 6.79
4.04110,538,829 8.176,553,005 7.97
5.2491,663,103 9.04226,986 8.76
9.7538,450,364 9.41368,550 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,
 202220212020
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 yield0.00%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— — 
Granted899,956 3.99 
Forfeited(689,328)3.94 
Balances at January 31, 2020
1,441,354 $3.94 
Vested— — 
Granted306,368 4.22 
Forfeited(84,723)3.91 
Balances at January 31, 2021
1,662,999 $3.98 
Vested(1,425,209)4.75 
Granted5,519,278 9.66 
Forfeited(317,332)5.89 
Balances at January 31, 2022
5,439,736 $9.42