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
	Apr. 30, 2022	Apr. 30, 2021
Numerator:
Net income (loss)	$ (89,266)	$ 82,289
Cumulative dividends on redeemable convertible preferred stock	0	(4,292)
Deemed dividends attributable to vested option holders	0	(51,855)
Deemed dividends attributable to common stock warrant holders	0	(110,635)
Net loss attributable to common stockholders - Basic	(89,266)	(84,493)
Gain attributable to earnout shares issued	0	(53,820)
Change in fair value of dilutive warrants	0	(49,471)
Net loss attributable to common stockholders - Diluted	$ (89,266)	$ (187,784)
Denominator:
Weighted average common shares outstanding (in shares)	334,743,634	218,932,121
Less: Weighted-average unvested restricted shares and shares subject to repurchase (in shares)	(119,939)	(316,258)
Weighted average shares outstanding - Basic (in shares)	334,623,695	218,615,863
Add: Earnout Shares under the treasury stock method (in shares)	0	2,956,122
Add: Public and Private Placement Warrants under the treasury stock method (in shares)	0	3,961,404
Weighted average shares outstanding - Diluted (in shares)	334,623,695	225,533,389
Net loss per share - Basic (USD per share)	$ (0.27)	$ (0.39)
Net loss per share - Diluted (USD per share)	$ (0.27)	$ (0.83)