Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 31, 2020	Jul. 31, 2020	Jan. 31, 2020	Apr. 30, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 1,636	$ 1,636	$ 2,300	$ 3,000
Total operating lease liabilities	1,636	1,636	$ 2,300	$ 3,000
Lease expense	221	514
Short-term lease expense	$ 10	$ 10