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Equity Plans and Stock-based Compensation (Tables)
 9 Months Ended
Oct. 31, 2021
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Option, Activity
The Company’s stock option awards activity is set forth below:
 Number of Stock Option AwardsWeighted Average Exercise PriceWeighted Average Remaining Contractual term (in years)Aggregate Intrinsic Value (in thousands)
Outstanding as of January 31, 202130,166,792 $0.71 7.3$1,064,539 
Options exercised(4,666,083)$0.59 
Options forfeited(624,618)$0.74 
Options expired(21,048)$53.26 
Outstanding as of October 31, 202124,855,043 $0.69 6.8$598,912 
Options vested and expected to vest as of October 31, 202124,314,890 $0.68 6.7$585,934 
Exercisable as of October 31, 202116,523,251 $0.66 6.2$398,582 
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
The Company’s RSU activity is set forth below:
 Number of SharesWeighted Average Grant Date Fair Value per Share
Outstanding as of January 31, 2021— $— 
RSU granted5,042,559 $26.94 
RSU vested(1,019,817)$27.36 
RSU forfeited(116,684)$27.17 
Outstanding as of October 31, 20213,906,058 $26.82 
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 condensed consolidated statements of operations:
Three Months Ended
October 31,		Nine Months Ended
October 31,
2021202020212020
(in thousands)(in thousands)
Cost of revenue$885 $29 $3,073 $93 
Research and development5,840 448 20,198 1,205 
Sales and marketing2,251 333 7,018 988 
General and administrative7,046 398 21,604 1,022 
Total stock-based compensation expense$16,022 $1,208 $51,893 $3,308