Leases - ASC 842 Quantitative Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Leases [Abstract]
Operating lease cost	$ 1,358	$ 1,431	$ 3,878	$ 4,343
Short-term lease cost	93	55	258	214
Short-term sublease income	(10)	(10)	(30)	(30)
Variable lease cost	14	(18)	621	352
Total lease cost	$ 1,455	$ 1,458	4,727	4,879
Cash paid for amounts included in the measurement of lease liabilities			4,172	3,697
Right-of-use assets obtained in exchange for new lease liabilities			$ 330	$ 587
Weighted-average remaining lease term (years)	3 years 4 months 24 days	4 years 3 months 18 days	3 years 4 months 24 days	4 years 3 months 18 days
Weighted-average discount rate	6.40%	6.40%	6.40%	6.40%