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, 2023	Apr. 30, 2022
Numerator:
Net loss	$ (79,388)	$ (89,266)
Denominator:
Weighted average common shares outstanding (in shares)	350,073,545	334,743,634
Less: Weighted-average unvested restricted shares and shares subject to repurchase (in shares)	(30,091)	(119,939)
Weighted average shares outstanding - basic (in shares)	350,043,454	334,623,695
Weighted average shares outstanding - diluted (in shares)	350,043,454	334,623,695
Net loss per share - basic (in USD per share)	$ (0.23)	$ (0.27)
Net loss per share - diluted (in USD per share)	$ (0.23)	$ (0.27)