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Stockholders’ Equity and Equity Incentive Plans (Tables)
 9 Months Ended
Oct. 31, 2021
Stockholders' Equity Note [Abstract]  
Summary of Stock Option Activity Under Equity Incentive Plan
A summary of stock option activity under our equity incentive plan and related information is as follows:
 Stock Options
Outstanding
Stock
Options		Weighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual
Life (Years)		Aggregate
Intrinsic
Value
(in thousands, except share, life, and per share data)
Balance as of January 31, 20219,239,504 $7.17 7.0$3,371,457 
Granted— $— 
Exercised(2,205,249)$5.01 
Canceled/forfeited/expired(128,780)$9.32 
Balance as of October 31, 20216,905,475 $7.83 6.3$1,842,547 
Vested and exercisable as of October 31, 20214,978,217 $5.16 6.0$1,341,584 
Summary of Restricted Stock Units (RSUs) Activity Under Equity Incentive Plan
A summary of restricted stock unit (“RSU”) activity under our equity incentive plan and related information is as follows:
RSUs
Unvested
RSUs		Weighted-
Average
Grant Date Fair Value Per Share
Unvested as of January 31, 20214,510,730 $194.57 
Granted2,046,653 $312.71 
Vested(1,480,536)$187.38 
Canceled/forfeited(233,344)$248.84 
Unvested as of October 31, 20214,843,503 $244.07 
Summary of Stock-based Compensation Expense by Line Item
The stock-based compensation expense by line item in the accompanying condensed consolidated statements of operations is summarized as follows:
Three Months Ended October 31,Nine Months Ended October 31,
2021202020212020
(in thousands)
Cost of revenue$17,206 $11,287 $46,050 $22,263 
Research and development27,879 16,035 71,615 31,269 
Sales and marketing54,220 46,716 156,888 96,237 
General and administrative15,496 19,887 41,359 29,788 
Total stock-based compensation expense$114,801 $93,925 $315,912 $179,557