Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (10,822)	$ (10,818)
Other comprehensive loss, net of tax:
Net unrealized losses on investments	0	(427)
Other comprehensive loss, net of tax	0	(427)
Comprehensive loss	$ (10,822)	$ (11,245)