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, 2026	Jan. 31, 2025	Jan. 31, 2024
Numerator:
Net loss	$ (59,342)	$ (81,935)	$ (75,569)
Denominator:
Weighted-average number of shares used in computing net loss per share, basic (shares)	40,984	38,501	36,050
Weighted-average number of shares used in computing net loss per share, diluted (shares)	40,984	38,501	36,050
Net loss per share, basic (in usd per share)	$ (1.45)	$ (2.13)	$ (2.10)
Net loss per share, diluted (in usd per share)	$ (1.45)	$ (2.13)	$ (2.10)
Class A Common Stock
Numerator:
Net loss	$ (4,726)	$ (6,946)	$ (6,842)
Denominator:
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)	$ (1.45)	$ (2.13)	$ (2.10)
Net loss per share, diluted (in usd per share)	$ (1.45)	$ (2.13)	$ (2.10)
Class B Common Stock
Numerator:
Net loss	$ (54,616)	$ (74,989)	$ (68,727)
Denominator:
Weighted-average number of shares used in computing net loss per share, basic (shares)	37,720	35,237	32,786
Weighted-average number of shares used in computing net loss per share, diluted (shares)	37,720	35,237	32,786
Net loss per share, basic (in usd per share)	$ (1.45)	$ (2.13)	$ (2.10)
Net loss per share, diluted (in usd per share)	$ (1.45)	$ (2.13)	$ (2.10)