Basic and Diluted Net Loss per Share - Computation of Basic and Diluted Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jul. 31, 2022	Apr. 30, 2022	Jul. 31, 2021	Apr. 30, 2021	Jul. 31, 2022	Jul. 31, 2021
Numerator:
Net loss	$ (92,700)	$ (89,266)	$ (84,938)	$ 82,289	$ (181,966)	$ (2,649)
Cumulative dividends on redeemable convertible preferred stock	0		0		0	(4,292)
Deemed dividends attributable to vested option holders	0		0		0	(51,855)
Deemed dividends attributable to common stock warrant holders	0		0		0	(110,635)
Net loss attributable to common stockholders - Basic	(92,700)		(84,938)		(181,966)	(169,431)
Gain attributable to earnout shares issued	0		0		0	(84,420)
Change in fair value of dilutive warrants	0		(7,427)		0	(53,540)
Net loss attributable to common stockholders - Diluted	$ (92,700)		$ (92,365)		$ (181,966)	$ (307,391)
Denominator:
Weighted average common shares outstanding (in shares)	336,911,941		312,465,016		335,845,756	266,473,703
Less: Weighted-average unvested restricted shares and shares subject to repurchase (in shares)	(98,386)		(237,490)		(108,984)	(276,221)
Weighted average shares outstanding - Basic (in shares)	336,813,555		312,227,526		335,736,772	266,197,482
Add: Earnout Shares under the treasury stock method (in shares)	0		0		0	7,464,203
Add: Public and Private Placement Warrants under the treasury stock method (in shares)	0		1,374,574		0	1,915,315
Weighted average shares outstanding - Diluted (in shares)	336,813,555		313,602,100		335,736,772	275,577,000
Net loss per share - Basic (USD per share)	$ (0.28)		$ (0.27)		$ (0.54)	$ (0.64)
Net loss per share - Diluted (USD per share)	$ (0.28)		$ (0.29)		$ (0.54)	$ (1.12)