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Stockholders’ Equity and Equity Incentive Plans (Tables)
 6 Months Ended
Jul. 31, 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(4,830,752)$3.61 
Canceled/forfeited/expired(132,739)$5.92 
Balance as of July 31, 202011,869,518 $6.59 7.4$2,935,477 
Vested and exercisable as of July 31, 20205,021,067 $3.28 6.8$1,258,445 
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 
Granted2,617,599 $202.30 
Vested(166,366)$88.53 
Canceled/forfeited(45,290)$98.34 
Unvested as of July 31, 20204,370,611 $152.33 
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 July 31, Six Months Ended July 31,
2020201920202019
(in thousands)
Cost of revenue$7,727 $1,902 $10,976 $2,732 
Research and development10,010 2,510 15,234 3,674 
Sales and marketing32,398 10,439 49,521 13,066 
General and administrative6,720 3,224 9,901 5,265 
Total stock-based compensation expense$56,855 $18,075 $85,632 $24,737