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Stockholders’ Equity and Equity Incentive Plan (Tables)
 3 Months Ended
Apr. 30, 2020
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, 202016,833,009  $5.73  7.6$1,191,881  
Granted—  $—  
Exercised(3,232,991) $2.97  
Canceled/forfeited/expired(52,093) $4.63  
Balance as of April 30, 202013,547,925  $6.39  7.6$1,744,720  
Vested and exercisable as of April 30, 20205,449,596  $2.70  7.0$721,922  
Summary of Restricted Stock Units (RSUs) Activity Under Equity Incentive Plan A summary of 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, 20201,964,668  $79.11  
Granted419,354  $119.62  
Vested(37,518) $80.36  
Canceled/forfeited(33,653) $80.78  
Unvested as of April 30, 20202,312,851  $86.42  
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 April 30,
20202019
(in thousands)
Cost of revenue$3,249  $830  
Research and development5,224  1,164  
Sales and marketing17,123  2,627  
General and administrative3,181  2,041  
Total stock-based compensation expense$28,777  $6,662