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Stock-Based Compensation (Tables)
9 Months Ended
Oct. 31, 2021
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Option, Activity
A summary of our stock option plan activity under the 2013 Plan 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, 202137,231,191 $1.68 8.34$442,515 
Granted14,048,623 $9.66 
Exercised(5,003,134)$1.37 
Forfeited(668,764)$3.46 
Outstanding as of October 31, 2021
45,607,916 $4.14 8.17$2,839,436 
Expected to vest as of October 31, 2021
45,607,916 $4.14 8.17$2,839,436 
Vested and exercisable as of October 31, 2021
17,549,104 $2.00 7.25$1,130,248 
Nonvested Restricted Stock Shares Activity
A summary of our RSUs is as follows:
Number of SharesWeighted-Average Grant Date Fair Value
Outstanding as of January 31, 2021— $— 
Granted541,929 $57.43 
Released(401)$66.33 
Forfeited(11,693)$52.32 
Outstanding as of October 31, 2021
529,835 $57.54 
A summary of our RSUs is as follows:
Number of SharesWeighted-Average Grant Date Fair Value
Outstanding as of January 31, 2021— $— 
Granted346,483 $32.39 
Released(1,624)$32.69 
Forfeited(5,716)$32.31 
Outstanding as of October 31, 2021
339,143 $32.39 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
Three Months Ended October 31,Nine Months Ended October 31,
2021202020212020
Expected term (in years)06.06.06.0
Expected volatility— %47.6 %
62.3% - 66.0%
47.6%- 48.5%
Risk-free interest rate— %0.4 %
0.8% - 1.1%
0.4% - 0.5%
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):
Three Months Ended October 31,Nine Months Ended October 31,
2021202020212020
Cost of revenue$1,202 $66 $2,425 $201 
Research and development9,035 443 24,997 3,467 
Sales and marketing4,848 985 10,800 2,052 
General and administrative12,277 3,101 23,970 4,114 
Total$27,362 $4,595 $62,192 $9,834