CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Redeemable Convertible Preferred Stock	Class A And Class B Common Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning Balance at Jan. 31, 2019	$ (37,569)		$ 1	$ 41,509	$ (79,079)
Temporary Equity, Beginning Balance, Shares at Jan. 31, 2019		88,076,852
Temporary Equity, Beginning Balance at Jan. 31, 2019		$ 174,389
Beginning Balance, Shares at Jan. 31, 2019			58,967,390
Issuance of common stock upon exercise of stock options	1,048			1,048
Issuance of common stock upon exercise of stock options, Shares			2,289,774
Issuance of common stock related to early exercised stock options			190,000
Vesting of early exercised stock options	190			190
Stock-based compensation	9,461			9,461
Net loss	(53,370)				(53,370)
Ending Balance at Jan. 31, 2020	(80,240)		$ 1	52,208	(132,449)
Temporary Equity, Ending Balance Shares at Jan. 31, 2020		88,076,852
Temporary Equity, Ending Balance at Jan. 31, 2020		$ 174,389
Ending Balance, Shares at Jan. 31, 2020			61,447,164
Issuance of Series E redeemable convertible preferred stock, net of issuance costs of $276		$ 174,724
Issuance of Series E redeemable convertible preferred stock, net of issuance costs of $276, Shares		6,051,132
Issuance of common stock upon exercise of stock options	2,629			2,629
Issuance of common stock upon exercise of stock options, Shares			4,130,713
Vesting of early exercised stock options	99			99
Stock-based compensation	39,223			39,223
Net loss	(83,515)				(83,515)
Ending Balance at Jan. 31, 2021	(121,804)		$ 1	94,159	(215,964)
Temporary Equity, Ending Balance Shares at Jan. 31, 2021		94,127,984
Temporary Equity, Ending Balance at Jan. 31, 2021		$ 349,113
Ending Balance, Shares at Jan. 31, 2021			65,577,877
Conversion of redeemable convertible preferred stock to common stock upon initial public offering	349,113	$ (349,113)	$ 1	349,112
Conversion of redeemable convertible preferred stock to common stock upon initial public offering, Shares		(94,127,984)	94,127,984
Issuance of common stock upon initial public offering, net of underwriting discounts and issuance costs	1,246,925		$ 1	1,246,924
Issuance of common stock upon initial public offering, net of underwriting discounts and issuance costs, Shares			16,530,000
Issuance of common stock for restricted stock awards, Shares			10,564
Issuance of common stock upon exercise of stock options	5,036			5,036
Issuance of common stock upon exercise of stock options, Shares			2,961,753
Vesting of early exercised stock options	18			18
Issuance of common stock upon settlement of restricted stock units, shares			4,355,635
Tax withholdings on settlement of restricted stock units value	(110,989)			(110,989)
Tax withholdings on settlement of restricted stock units shares			(1,397,253)
Stock-based compensation	204,130			204,130
Net loss	(290,138)				(290,138)
Ending Balance at Jan. 31, 2022	$ 1,282,291		$ 3	$ 1,788,390	$ (506,102)
Temporary Equity, Ending Balance Shares at Jan. 31, 2022		0
Ending Balance, Shares at Jan. 31, 2022			182,166,560