Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (26,411)	$ (59,786)	$ (44,792)
Other comprehensive income (loss), net of tax:
Net change and reclassification of unrealized gains (losses) on investments	(1,219)	451	671
Other comprehensive income (loss), net of tax	(1,219)	451	671
Comprehensive loss	$ (27,630)	$ (59,335)	$ (44,121)