Basic and Diluted Net Loss Per Share - Summary of Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Numerator:
Net income (loss)	$ 82,289	$ (30,098)
Adjust: Cumulative dividends on redeemable convertible preferred stock	(4,292)
Adjust: Deemed dividends attributable to vested option holders	(51,855)
Adjust: Deemed dividends attributable to common stock warrant holders	(110,635)
Net loss attributable to common stockholders - Basic	(84,493)	(30,098)
Less: Gain attributable to earnout shares issued	(53,820)
Change in fair value of warrant liabilities	(49,471)
Net loss attributable to common stockholders - Diluted	$ (187,784)	$ (30,098)
Denominator:
Weighted average common shares outstanding	218,932,121	12,432,519
Less: Weighted-average unvested restricted shares and shares subject to repurchase	(316,258)	(179,427)
Weighted average shares outstanding - Basic	218,615,863	12,253,092
Add: Earnout Shares under the treasury stock method	2,956,122	0
Add: Public and Private Placement Warrants under the treasury stock method	3,961,404	0
Weighted average shares outstanding - Diluted	225,533,389	12,253,092
Net loss per share - Basic	$ (0.39)	$ (2.46)
Net loss per share - Diluted	$ (0.83)	$ (2.46)