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Equity Plans and Stock-based Compensation (Tables)
 12 Months Ended
Jan. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-based Compensation Expense
The following sets forth the total stock-based compensation expense for employee equity plans included in the Company’s consolidated statements of operations:
Year Ended January 31,
202420232022
(in thousands)
Cost of revenue$6,154 $4,351 $3,782 
Research and development50,935 37,967 25,461 
Sales and marketing22,934 17,393 9,154 
General and administrative37,314 33,639 28,934 
Total stock-based compensation expense$117,337 $93,350 $67,331 
Share-based Payment Arrangement, Option, Activity A summary of option activity under the 2017 and 2007 Plans at January 31, 2024 and changes during the periods then ended is presented in the following table:
Number of
Stock Option
Awards		Weighted
Average
Exercise Price		Weighted
Average
Remaining Contractual term
(in years)		Aggregate
Intrinsic Value
(in thousands)
Outstanding as of January 31, 2023
17,600,524 $0.70 5.6$201,352 
Exercised(5,976,138)$0.63 
Cancelled(227,630)$0.77 
Outstanding as of January 31, 2024
11,396,756 $0.74 4.8$13,276 
Options vested and expected to vest as of January 31, 2024
11,396,739 $0.74 4.8$13,276 
Exercisable as of January 31, 2024
11,301,564 $0.73 4.8$13,167 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The weighted-average assumptions in the Monte Carlo valuation model used to determine the fair value of PRSUs granted during the year ended January 31, 2024 and 2023 were as follows:
Year Ended January 31,
20242023
Expected volatility
68.4%- 82.4%
72.1% - 74.0%
Risk-free interest rate
4.0% - 4.3%
2.8% - 3.3%
Dividend rate0.0 %0.0 %
Expected term (in years)
0.9 - 3.1
0.3 - 4.8
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
The weighted-average assumptions in the Black-Scholes option-pricing models used to determine the fair value of ESPP rights granted during the year ended January 31, 2024, 2023 and 2022 were as follows:

Year Ended January 31,
202420232022
Expected volatility
62.3% - 70.8%
64.9% - 72.2%
61.8% - 73.5%
Risk-free interest rate
4.5% - 5.4%
0.8% - 3.6%
0.1% - 0.3%
Dividend rate0.0 %0.0 %0.0 %
Expected term (in years)
0.5 - 2.0
0.5 - 2.0
0.4 - 1.9
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
The 2021 EIP provides for the issuance of RSUs to employees and directors. A summary of activity of RSUs under the 2021 EIP at January 31, 2024 and changes during the periods then ended is presented in the following table:
 Number of SharesWeighted Average Grant Date Fair Value per Share
Outstanding as of January 31, 202312,935,413 $15.02 
RSU granted26,348,986 $5.85 
RSU vested(6,249,909)$13.53 
RSU forfeited(4,618,363)$11.95 
Outstanding as of January 31, 202428,416,127 $7.35 
A summary of activity of PRSUs under the 2021 EIP at January 31, 2024 and changes during the periods then ended is presented in the following table:
 Number of SharesWeighted Average Grant Date Fair Value per Share
Outstanding as of January 31, 20232,147,366 $10.83 
PRSU granted1,621,236 $2.84 
PRSU forfeited(620,820)$10.47 
Outstanding as of January 31, 20243,147,782 $6.79