Equity - Schedule of Stock Reserved For Future Issuance (Details) $ / shares in Units, $ in Millions	Nov. 18, 2021 USD ($) shares	Jan. 31, 2022 tranche $ / shares shares	Oct. 18, 2021 shares	Oct. 17, 2021 shares	Jan. 31, 2021 shares	Jan. 31, 2020 shares	Jan. 31, 2019 shares
Class of Stock [Line Items]
Convertible preferred stock, shares outstanding (in shares)		0	79,600,000	79,600,000	79,551,000	79,959,000	65,546,000
Options issued and outstanding (in shares)		17,146,000			16,043,000	16,253,000	9,817,000
Shares available for issuance under Equity Incentive Plans (in shares)		18,248,000			4,796,000	1,540,000
Warrant exercise price (in USD per share) | $ / shares		$ 1.18
Warrants issued, number of tranches | tranche		2
Class A and Class B common stock
Class of Stock [Line Items]
Convertible preferred stock, shares outstanding (in shares)					79,551,000
Options issued and outstanding (in shares)		17,146,000			16,043,000
Shares available for issuance under Equity Incentive Plans (in shares)		18,248,000			4,796,000
Shares reserved for issuance to charitable organizations (in shares)		1,636,000
Warrants issued and outstanding (in shares)		0			73,000
Common stock reserved for future issuance (in shares)		43,581,000			100,463,000
Class B Common Stock
Class of Stock [Line Items]
Common stock issued for warrant exercises (in shares)	72,772
Proceeds from the issuance of common stock upon exercise of stock options, including early exercises, net of repurchases | $	$ 0.1
RSUs | Class A and Class B common stock
Class of Stock [Line Items]
Share-based compensation awards other than options (in shares)		3,280,000
Shares subject to the 2021 ESPP | Class A and Class B common stock
Class of Stock [Line Items]
Share-based compensation awards other than options (in shares)		3,271,000