Net Loss Per Share - Computation of Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (105,551)	$ (102,111)	$ (84,634)
Weighted-average number of shares used in computing net loss per share, basic (shares)	34,092	32,021	29,308
Weighted-average number of shares used in computing net loss per share, diluted (shares)	34,092	32,021	29,308
Net loss per share, basic (in usd per share)	$ (3.10)	$ (3.19)	$ (2.89)
Net loss per share, diluted (in usd per share)	$ (3.10)	$ (3.19)	$ (2.89)
Class A Common Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (10,106)	$ (10,408)	$ (9,426)
Weighted-average number of shares used in computing net loss per share, basic (shares)	3,264	3,264	3,264
Weighted-average number of shares used in computing net loss per share, diluted (shares)	3,264	3,264	3,264
Net loss per share, basic (in usd per share)	$ (3.10)	$ (3.19)	$ (2.89)
Net loss per share, diluted (in usd per share)	$ (3.10)	$ (3.19)	$ (2.89)
Class B Common Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (95,445)	$ (91,703)	$ (75,208)
Weighted-average number of shares used in computing net loss per share, basic (shares)	30,828	28,757	26,044
Weighted-average number of shares used in computing net loss per share, diluted (shares)	30,828	28,757	26,044
Net loss per share, basic (in usd per share)	$ (3.10)	$ (3.19)	$ (2.89)
Net loss per share, diluted (in usd per share)	$ (3.10)	$ (3.19)	$ (2.89)