Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 31, 2019	Oct. 31, 2019	Apr. 30, 2019	Feb. 01, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 2,455	$ 2,455	$ 3,000	$ 2,710
Total operating lease liabilities	2,455	2,455	$ 3,000	$ 2,710
Lease expense	294	881
Short-term lease expense	$ 10	$ 30