Leases - ASC 842 Quantitative Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Leases [Abstract]
Operating lease cost	$ 1,269	$ 1,327
Short-term lease cost	108	97
Sublease income	(10)	(10)
Variable lease cost	261	253
Total lease cost	1,628	1,667
Cash paid for amounts included in the measurement of lease liabilities	1,433	1,454
Right-of-use assets obtained in exchange for new lease liabilities	$ 292	$ 98
Weighted-average remaining lease term (years)	2 years 2 months 12 days	2 years 10 months 24 days
Weighted-average discount rate	6.33%	6.38%