Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jul. 30, 2020	Feb. 01, 2019	Jan. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 1,471	$ 2,300
Total operating lease liabilities	1,471	2,300
Lease expense	828	1,200
Short-term lease expense	20	30
ASU 2016-02
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets				$ 3,000
Total operating lease liabilities				$ 3,000
Office
Lessee, Lease, Description [Line Items]
Facility lease expense	$ 1,200	$ 1,200
Maximum
Lessee, Lease, Description [Line Items]
Operating leases, non-cancelable term (in years)	1 year	1 year	1 year		1 year