Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 31, 2020	Oct. 31, 2020	Jan. 31, 2020	Apr. 30, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 1,363	$ 1,363	$ 2,300	$ 3,000
Operating lease liabilities	1,363	1,363	$ 2,300	$ 3,000
Lease expense	313	828
Short-term lease expense	$ 10	$ 20