Net Loss per Share - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Numerator:
Net loss	$ (13,861)	$ (5,284)	$ (37,134)	$ (38,490)
Dividend on series A convertible preferred stock	(3,775)		(7,104)
Accretion of series A convertible preferred stock	(526)		(982)
Net loss attributable to common stockholders	$ (18,162)	$ (5,284)	$ (45,220)	$ (38,490)
Denominator:
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	151,426	157,465	158,068	154,734
Net loss per share attributable to common stockholders, basic and diluted	$ (0.12)	$ (0.03)	$ (0.29)	$ (0.25)