Preferred Stock - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Jul. 31, 2021 shares	Oct. 31, 2020 shares	Oct. 31, 2020 USD ($) shares	Oct. 31, 2021 $ / shares shares	Jul. 01, 2021 shares	Jan. 31, 2021 $ / shares shares	Jul. 31, 2020 shares	Jan. 31, 2020 shares
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares outstanding (in shares)		167,058,113	167,058,113	0		167,058,113	144,929,131	113,523,948
Preferred stock, shares authorized (in shares)				50,000,000		0
Preferred stock, par or stated value per share (in USD per share) | $ / shares				$ 0.0001		$ 0.0001
Preferred stock, shares outstanding (in shares)				0		0
Redeemable convertible preferred stock
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares outstanding (in shares)					167,058,113
Preferred stock, convertible, conversion ratio	1
Class B
Temporary Equity [Line Items]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)	169,787,200
Conversion of redeemable convertible preferred stock to common stock upon initial public offering, not on a one-for-one basis (in shares)	34,134,270
Series E
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares outstanding (in shares)					31,405,183	31,405,183
Issuance of Preferred Stock, net of issuance costs (in shares)			31,405,183
Original issuance price per share (in USD per share) | $ / shares						$ 4.8617
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs | $			$ 152,500
Temporary equity, issuance costs | $			$ 100
Series F
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares outstanding (in shares)						22,128,982
Issuance of Preferred Stock, net of issuance costs (in shares)		22,128,982	22,128,982
Original issuance price per share (in USD per share) | $ / shares						$ 12.0614
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs | $			$ 266,800
Temporary equity, issuance costs | $			$ 100