Net Loss Per Share - Computation of Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Oct. 31, 2023	Jul. 31, 2023	Apr. 30, 2023	Oct. 31, 2022	Jul. 31, 2022	Apr. 30, 2022	Oct. 31, 2023	Oct. 31, 2022
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (16,413)	$ (16,068)	$ (24,403)	$ (23,711)	$ (29,139)	$ (32,888)	$ (56,884)	$ (85,738)
Weighted-average number of shares used in computing net loss per share, basic (shares)	36,310			34,392			35,812	33,893
Weighted-average number of shares used in computing net loss per share, diluted (shares)	36,310			34,392			35,812	33,893
Net loss per share, basic (in usd per share)	$ (0.45)			$ (0.69)			$ (1.59)	$ (2.53)
Net loss per share, diluted (in usd per share)	$ (0.45)			$ (0.69)			$ (1.59)	$ (2.53)
Class A Common Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (1,475)			$ (2,250)			$ (5,185)	$ (8,257)
Weighted-average number of shares used in computing net loss per share, basic (shares)	3,264			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	3,264
Net loss per share, basic (in usd per share)	$ (0.45)			$ (0.69)			$ (1.59)	$ (2.53)
Net loss per share, diluted (in usd per share)	$ (0.45)			$ (0.69)			$ (1.59)	$ (2.53)
Class B Common Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (14,938)			$ (21,461)			$ (51,699)	$ (77,481)
Weighted-average number of shares used in computing net loss per share, basic (shares)	33,046			31,128			32,548	30,629
Weighted-average number of shares used in computing net loss per share, diluted (shares)	33,046			31,128			32,548	30,629
Net loss per share, basic (in usd per share)	$ (0.45)			$ (0.69)			$ (1.59)	$ (2.53)
Net loss per share, diluted (in usd per share)	$ (0.45)			$ (0.69)			$ (1.59)	$ (2.53)