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Stock-Based Compensation (Tables)
 12 Months Ended
Jan. 31, 2023
Share-based Payment Arrangement [Abstract]  
Nonvested Restricted Stock Shares Activity
A summary of our RSU activity is as follows:
Number of SharesWeighted-Average Grant Date Fair Value
Outstanding as of January 31, 2022
1,770,304 $52.51 
Granted14,992,931 26.28 
Released(1,303,854)41.96 
Forfeited(1,050,215)36.19 
Outstanding as of January 31, 2023
14,409,166 $27.37 
Share-based Payment Arrangement, Option, Activity
A summary of our stock option activity is as follows:
Number of OptionsWeighted-Average Exercise PriceWeighted-Average Remaining Contractual Term (in years)Aggregate Intrinsic Value (in thousands)
Outstanding as of January 31, 2022
42,422,473 $4.30 6.50$1,714,821 
Granted— — 
Exercised(7,650,525)2.26 
Forfeited(2,703,962)4.68 
Assumed options from Attivo acquisition
378,828 1.31 
Outstanding as of January 31, 2023
32,446,814 $4.71 6.52$337,214 
Expected to vest as of January 31, 2023
32,446,814 $4.71 6.52$337,214 
Vested and exercisable as of January 31, 2023
19,645,571 $3.54 5.97$227,200 
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
The following table summarizes assumptions used in estimating the fair value of employee stock purchase rights for the initial and subsequent offering periods under the 2021 ESPP using the Black-Scholes option pricing model:
Year Ended January 31,
20232022
Expected term (in years)
0.5 - 1.0
0.5 - 2.0
Expected volatility
71.5% - 95.8%
52.3% - 70.5%
Risk-free interest rate
2.6% - 4.8%
0.1% - 0.3%
Dividend yield— %— %
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following table summarizes assumptions used in estimating the fair value of stock options granted under the Black-Scholes pricing model in fiscal 2022 (no stock options were granted in fiscal 2023):
Year Ended January 31,
2022
Expected term (in years)6.0
Expected volatility
62.3% - 66.0%
Risk-free interest rate
0.8% - 1.1%
Dividend yield— %
Schedule of Components of Stock-based Compensation Expense
The components of stock-based compensation expense recognized in the consolidated statements of operations consisted of the following (in thousands):
Year Ended January 31,
20232022
Cost of revenue$10,093 $3,618 
Research and development51,771 35,358 
Sales and marketing40,115 15,460 
General and administrative62,487 33,453 
Total$164,466 $87,889