v3.20.1
Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan (Tables)
 12 Months Ended
Jan. 31, 2020
Equity [Abstract]  
Schedule of Stock by Class
Convertible preferred stock consisted of the following as of January 31, 2019 and as of immediately prior to the automatic conversion of convertible preferred stock into common stock:
 As of January 31, 2019
 Designated
Shares
Authorized		Shares Issued
and
Outstanding		Aggregate
Liquidation
Preference
(in thousands, except share data)
Series A67,083,500  61,717,700  $9,258  
Series B25,857,784  25,857,784  6,500  
Series C34,363,256  34,363,256  30,000  
Series D30,800,000  30,727,064  114,966  
Total convertible preferred stock158,104,540  152,665,804  $160,724  
Schedule of Stock by Class Reserved for Future Issuance
We have the following shares of common stock reserved for future issuance:
 
As of January 31,
 20202019
Conversion of convertible preferred stock—  152,665,804  
Stock options outstanding16,833,009  35,064,465  
RSUs outstanding1,964,668  —  
ESPP purchase rights outstanding 1,323,662  —  
Remaining shares available for future issuance under the 2011 and 2019 plan33,604,587  1,848,100  
Remaining shares available for future issuance under the ESPP7,186,070  —  
Total shares of common stock reserved60,911,996  189,578,369  
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, 201935,064,465  $1.48  6.8$534,572  
Granted1,576,150  $36.86  
Exercised(19,003,652) $0.49  $767,336  
Canceled/forfeited/expired(803,954) $5.15  
Balance as of January 31, 202016,833,009  $5.73  7.6$1,191,881  
Vested and exercisable as of January 31, 20207,248,393  $1.78  6.8$540,222  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The Black-Scholes assumptions used to value the employee options at the grant dates are as follows:

Year Ended January 31,
202020192018
Expected term (years)
5.0 - 6.1
5.0 - 6.2
5.6 - 6.7
Expected volatility
49.9% - 53.2%
44.6% - 48.2%
47.7% - 52.0%
Risk-free interest rate
1.6% - 2.5%
2.6% - 3.1%
1.8% - 2.3%
Expected dividend yield—  —  —  
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, 2019—  $—  
Granted2,048,248  $79.22  
Vested(31,649) $78.23  
Canceled/forfeited(51,931) $84.00  
Unvested as of January 31, 20201,964,668  $79.11  
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:
Year Ended
January 31, 2020
Expected term (years)
0.5 - 2.1
Expected volatility
40.3% - 56.2%
Risk-free interest rate
1.5% - 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 consolidated statements of operations is summarized as follows:
Year Ended January 31,
202020192018
(in thousands)
Cost of revenue$7,860  $1,119  $204  
Research and development11,645  1,369  360  
Sales and marketing41,465  3,540  812  
General and administrative12,139  2,913  8,953  
Total stock-based compensation expense$73,109  $8,941  $10,329