Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Class A and Class B Common Stock Class A and Class B Common Stock
Shares, beginning of period (in shares) at Jan. 31, 2021	167,058,113
Balance, beginning of period at Jan. 31, 2021	$ 621,139
Shares, end of period (in shares) at Apr. 30, 2021	167,058,113
Balance, end of period at Apr. 30, 2021	$ 621,139
Shares, beginning of period (in shares) at Jan. 31, 2021					39,242,316
Balance, beginning of period at Jan. 31, 2021	(320,536)	$ 29,869	$ 165	$ (350,572)	$ 2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					2,649,961
Issuance of common stock upon exercise of stock options	3,210	3,210
Issuance of common stock and awards assumed in connection with acquistion (in shares)					7,277,214
Issuance of common stock in connection with acquisition	120,319	120,318			$ 1
Issuance of restricted stock awards (in shares)					1,315,099
Issuance of stock for services provided (in shares)					20,000
Vesting of early exercised stock options	17	17
Stock-based compensation	13,560	13,560
Other comprehensive income (loss)	0
Foreign currency translation adjustments	190		190
Net loss	(62,634)			(62,634)
Shares, end of period (in shares) at Apr. 30, 2021					50,504,590
Balance, end of period at Apr. 30, 2021	$ (245,874)	166,974	355	(413,206)	$ 3
Shares, beginning of period (in shares) at Jan. 31, 2022	0
Balance, beginning of period at Jan. 31, 2022	$ 0
Shares, end of period (in shares) at Apr. 30, 2022	0
Balance, end of period at Apr. 30, 2022	$ 0
Shares, beginning of period (in shares) at Jan. 31, 2022					270,451,615
Balance, beginning of period at Jan. 31, 2022	1,650,788	2,271,980	454	(621,673)	$ 27
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					2,018,597
Issuance of common stock upon exercise of stock options	5,090	5,090
Vesting of restricted stock units (in shares)					26,412
Vesting of early exercised stock options	18	18
Stock-based compensation	32,417	32,417
Other comprehensive income (loss)	(1,237)		(1,237)
Foreign currency translation adjustments	0
Net loss	(89,834)			(89,834)
Shares, end of period (in shares) at Apr. 30, 2022					272,496,624
Balance, end of period at Apr. 30, 2022	$ 1,597,242	$ 2,309,505	$ (783)	$ (711,507)	$ 27