Leases - ASC 842 Quantitative Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Leases [Abstract]
Operating lease cost	$ 1,327	$ 1,238
Short-term lease cost	97	96
Sublease income	(10)	(10)
Variable lease cost	253	530
Total lease cost	1,667	1,854
Cash paid for amounts included in the measurement of lease liabilities	1,454	1,328
Right-of-use assets obtained in exchange for new lease liabilities	$ 98	$ 165
Weighted-average remaining lease term (years)	2 years 10 months 24 days	3 years 9 months 18 days
Weighted-average discount rate	6.38%	6.40%