Stock-Based Compensation - Summary Stock Option Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Number of Options
Outstanding, beginning of period (in shares)	37,231,191
Outstanding, end of period (in shares)	42,422,473	37,231,191
2013 Equity Incentive Plan
Number of Options
Outstanding, beginning of period (in shares)	37,231,191
Granted (in shares)	14,048,623
Exercised (in shares)	(8,406,950)
Forfeited (in shares)	(1,131,723)
Outstanding, end of period (in shares)	41,741,141	37,231,191
Expected to vest (in shares)	41,741,141
Options, vested and exercisable, number (in shares)	17,467,223
Weighted-Average Exercise Price
Outstanding, beginning of period (in USD per share)	$ 1.68
Granted (in USD per share)	9.66
Exercised (in USD per share)	1.52
Forfeited (in USD per share)	3.34
Outstanding, end of period (in USD per share)	4.34	$ 1.68
Expected to vest (in USD per shares)	4.34
Options, vested and exercisable, weighted average exercise price (in USD per share)	$ 2.47
Weighted-Average Remaining Contractual Term (in years)
Weighted-Average Remaining Contractual Term (in years), Outstanding	7 years 11 months 12 days	8 years 4 months 2 days
Expected to vest (in years)	7 years 11 months 12 days
Weighted-Average Remaining Contractual Term (in years), Vested and exercisable (in years)	7 years 1 month 28 days
Aggregate Intrinsic Value (in thousands)
Outstanding, beginning of period	$ 442,515
Outstanding, end of period	1,686,738	$ 442,515
Expected to vest	1,686,738
Vested and exerisable	$ 738,584