Leases - ASC 842 Quantitative Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Leases [Abstract]
Operating lease cost	$ 1,281	$ 1,288	$ 2,550	$ 2,615
Short-term lease cost	80	79	188	176
Sublease income	(10)	(10)	(20)	(20)
Variable lease cost	160	278	421	531
Total lease cost	$ 1,511	$ 1,635	3,139	3,302
Cash paid for amounts included in the measurement of lease liabilities			2,890	2,880
Right-of-use assets obtained in exchange for new lease liabilities			$ 364	$ 398
Weighted-average remaining lease term (years)	1 year 8 months 12 days	2 years 8 months 12 days	1 year 8 months 12 days	2 years 8 months 12 days
Weighted-average discount rate	6.36%	6.38%	6.36%	6.38%