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, 2025	Jul. 31, 2025	Apr. 30, 2025	Oct. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Oct. 31, 2025	Oct. 31, 2024
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (10,388)	$ (22,932)	$ (18,052)	$ (18,761)	$ (19,490)	$ (26,007)	$ (51,372)	$ (64,258)
Weighted-average number of shares used in computing net loss per share, basic (shares)	41,448			38,832			40,618	38,243
Weighted-average number of shares used in computing net loss per share, diluted (shares)	41,448			38,832			40,618	38,243
Net loss per share, basic (in usd per share)	$ (0.25)			$ (0.48)			$ (1.26)	$ (1.68)
Net loss per share, diluted (in usd per share)	$ (0.25)			$ (0.48)			$ (1.26)	$ (1.68)
Class A Common Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (818)			$ (1,577)			$ (4,128)	$ (5,484)
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)	$ (0.25)			$ (0.48)			$ (1.26)	$ (1.68)
Net loss per share, diluted (in usd per share)	$ (0.25)			$ (0.48)			$ (1.26)	$ (1.68)
Class B Common Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (9,570)			$ (17,184)			$ (47,244)	$ (58,774)
Weighted-average number of shares used in computing net loss per share, basic (shares)	38,184			35,568			37,354	34,979
Weighted-average number of shares used in computing net loss per share, diluted (shares)	38,184			35,568			37,354	34,979
Net loss per share, basic (in usd per share)	$ (0.25)			$ (0.48)			$ (1.26)	$ (1.68)
Net loss per share, diluted (in usd per share)	$ (0.25)			$ (0.48)			$ (1.26)	$ (1.68)