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Equity (Tables)
 12 Months Ended
Jan. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Shares Reserved For Future Issuance
The Company had reserved shares of common stock for future issuance as follows:
January 31, 2021January 31, 2020
Redeemable convertible preferred stock— 169,921,272 
Common stock warrants— 32,336 
2012 Equity Incentive Plan:
Options outstanding64,574,656 80,903,200 
RSUs outstanding7,520,474 — 
Shares available for future grants— 412,401 
2020 Equity Incentive Plan:
Shares available for future grants32,871,367 — 
RSUs outstanding1,828,083 — 
2020 ESPP:
Shares available for future grants5,700,000 — 
Total shares of common stock reserved for future issuance112,494,580 251,269,209 
Option Activity Rollforward
Stock option activity and activity regarding shares available for grant under the Plans during the fiscal years ended January 31, 2021, 2020, and 2019 is as follows:
Shares
Available for Grant		Number of Options OutstandingWeighted-
Average
Exercise Price		Weighted-Average Remaining Contractual Life
(in years)		Aggregate
Intrinsic
Value
(in thousands)
Balance—February 1, 2018
18,692,404 33,242,864 $1.03 8.8$98,314 
Shares authorized11,322,700 — 
Options granted(25,229,343)25,229,343 $4.41 
Options exercised — (5,292,551)$1.14 
Options forfeited1,644,213 (1,644,213)$2.23 
Restricted stock awards granted(950,000)— 
Balance—January 31, 2019
5,479,974 51,535,443 $2.63 8.8$287,993 
Shares authorized33,799,630 — 
Options granted(46,934,532)46,934,532 $9.21 
Options exercised— (9,735,006)$3.47 
Options forfeited7,831,769 (7,831,769)$4.07 
Repurchase of unvested common stock252,260 — 
Restricted stock awards granted(16,700)— 
Balance—January 31, 2020
412,401 80,903,200 $6.21 8.6$1,546,313 
Shares authorized54,970,187—
Shares ceased to be available for issuance under the 2012 Plan(15,696,031)—
Options granted(876,961)876,961$34.83 
Options exercised—(13,798,741)$3.90 
Options forfeited3,406,764(3,406,764)$7.04 
Repurchase of unvested common stock40,000—
RSUs granted(9,552,687)—
RSUs forfeited167,694—
Balance—January 31, 2021
32,871,36764,574,656$7.04 7.7$17,138,896 
Vested and exercisable as of January 31, 2021
27,056,647$5.46 7.2$7,223,808 
Option Rollforward Schedule
Stock option activity and activity regarding shares available for grant under the Plans during the fiscal years ended January 31, 2021, 2020, and 2019 is as follows:
Shares
Available for Grant		Number of Options OutstandingWeighted-
Average
Exercise Price		Weighted-Average Remaining Contractual Life
(in years)		Aggregate
Intrinsic
Value
(in thousands)
Balance—February 1, 2018
18,692,404 33,242,864 $1.03 8.8$98,314 
Shares authorized11,322,700 — 
Options granted(25,229,343)25,229,343 $4.41 
Options exercised — (5,292,551)$1.14 
Options forfeited1,644,213 (1,644,213)$2.23 
Restricted stock awards granted(950,000)— 
Balance—January 31, 2019
5,479,974 51,535,443 $2.63 8.8$287,993 
Shares authorized33,799,630 — 
Options granted(46,934,532)46,934,532 $9.21 
Options exercised— (9,735,006)$3.47 
Options forfeited7,831,769 (7,831,769)$4.07 
Repurchase of unvested common stock252,260 — 
Restricted stock awards granted(16,700)— 
Balance—January 31, 2020
412,401 80,903,200 $6.21 8.6$1,546,313 
Shares authorized54,970,187—
Shares ceased to be available for issuance under the 2012 Plan(15,696,031)—
Options granted(876,961)876,961$34.83 
Options exercised—(13,798,741)$3.90 
Options forfeited3,406,764(3,406,764)$7.04 
Repurchase of unvested common stock40,000—
RSUs granted(9,552,687)—
RSUs forfeited167,694—
Balance—January 31, 2021
32,871,36764,574,656$7.04 7.7$17,138,896 
Vested and exercisable as of January 31, 2021
27,056,647$5.46 7.2$7,223,808 
Schedule of Unvested RSA Rollforward
Restricted Stock Awards—Restricted stock award activity during the fiscal years ended January 31, 2021, 2020, and 2019 is as follows:
Under the PlansOut of the Plans
Number of SharesWeighted-Average Grant Date
Fair Value
per Share		Number of SharesWeighted-Average Grant Date
Fair Value
per Share
Unvested Balance—February 1, 2018
392,210 $4.00 2,054,890 $1.20 
Granted950,000 7.44 — — 
Vested(421,830)$4.67 (402,444)$— 
Unvested Balance—January 31, 2019
920,380 $7.24 1,652,446 $1.49 
Granted16,700 $8.58 661,635 $1.61 
Vested(920,380)$7.24 (442,222)$0.50 
Repurchased— $— (268,297)$— 
Unvested Balance—January 31, 2020
16,700 $8.58 1,603,562 $2.06 
Vested(16,700)$8.58 (861,651)$2.03 
Unvested Balance—January 31, 2021
— $— 741,911 $2.11 
Schedule of Unvested RSU Rollforward
RSU activity during the fiscal year ended January 31, 2021 was as follows:
Number of SharesWeighted-Average Grant Date
Fair Value
per Share
Unvested Balance—January 31, 2020
— $— 
Granted9,552,687 $123.71 
Vested(36,436)$50.71 
Forfeited(167,694)$64.13 
Unvested Balance—January 31, 2021
9,348,557 $125.06 
Valuation Assumptions Schedule The following table summarizes the weighted-average assumptions used in estimating the fair value of stock options granted to employees and non-employees for the fiscal years ended January 31, 2021, 2020, and 2019:
Fiscal Year Ended January 31,
202120202019
Expected term (in years)6.06.06.3
Expected volatility37.2 %36.9 %42.9 %
Risk-free interest rate1.0 %2.0 %2.9 %
Expected dividend yield— %— %— %
Valuation Assumptions Other Than Stock Options Schedule
The following table summarizes the weighted-average assumptions used in estimating the fair value of ESPP for the initial offering period using the Black-Scholes option-pricing model:

Fiscal Year Ended
January 31, 2021
Expected term (in years)0.5
Expected volatility60.1 %
Risk-free interest rate0.1 %
Expected dividend yield— %
Share-based Compensation Schedule
Stock-based compensation expense included in the consolidated statements of operations was as follows (in thousands):
Fiscal Year Ended January 31,
202120202019
Cost of revenue$33,642 $3,650 $1,895 
Sales and marketing97,879 20,757 15,647 
Research and development99,223 15,743 28,284 
General and administrative70,697 38,249 6,912 
Stock-based compensation, net of amounts capitalized301,441 78,399 52,738 
Capitalized stock-based compensation2,072 1,080 577 
Total stock-based compensation$303,513 $79,479 $53,315