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Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan (Tables)
 6 Months Ended
Jul. 31, 2019
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:
 Options Outstanding
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)
Outstanding as of January 31, 201935,064,465  $1.48  6.8$534,572  
Granted1,537,900  36.77  
Exercised(14,272,059) 0.16  
Canceled/forfeited/expired(284,118) 6.11  
Outstanding as of July 31, 201922,046,188  $4.73  8.0$2,001,410  
Vested as of July 31, 20198,692,345  $1.02  7.1$821,380  
Summary of Restricted Stock Units (RSUs) Activity Under Equity Incentive Plan A summary of restricted stock units (RSUs) activity under our equity incentive plan and related information is as follows:
 RSUs Outstanding
Outstanding
RSUs		Weighted-
Average
Grant Date Fair Value Per Share
Outstanding as of January 31, 2019—  $—  
Granted376,786  93.89  
Canceled/forfeited(5,926) 94.52  
Outstanding as of July 31, 2019370,860  $93.88  
Summary of Assumptions for Estimating Fair Value of ESPP Purchase Rights We estimated the fair value of ESPP purchase rights using a Black-Scholes option-pricing model with the following assumptions:
Three Months Ended
July 31, 2019
Expected purchase price$30.60 - $83.39
Expected volatility46.1% - 56.2%  
Expected term (years)0.5 - 2.1  
Risk-free interest rate1.9% - 2.5%  
Expected dividend yield—  
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,
2019201820192018
(in thousands)
Cost of revenue$1,902  $130  $2,732  $225  
Research and development2,510  193  3,674  322  
Sales and marketing10,439  492  13,066  888  
General and administrative3,224  311  5,265  540  
Total stock-based compensation expense$18,075  $1,126  $24,737  $1,975