Leases - ASC 842 Quantitative Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Leases [Abstract]
Operating lease cost	$ 1,288	$ 1,283	$ 2,615	$ 2,520
Short-term lease cost	79	68	176	165
Sublease income	(10)	(10)	(20)	(20)
Variable lease cost	278	77	531	607
Total lease cost	$ 1,635	$ 1,418	3,302	3,272
Cash paid for amounts included in the measurement of lease liabilities			2,880	2,712
Right-of-use assets obtained in exchange for new lease liabilities			$ 398	$ 165
Weighted-average remaining lease term (years)	2 years 8 months 12 days	3 years 7 months 6 days	2 years 8 months 12 days	3 years 7 months 6 days
Weighted-average discount rate	6.38%	6.40%	6.38%	6.40%