Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Feb. 01, 2019
Assets
Operating lease right-of-use assets	$ 3,014	$ 2,710
Lease commenced during quarter	592
Payments, amortization and terminations	(288)
Liabilities
Total operating lease liabilities	3,014	2,710
Lease commenced during quarter	592
Payments, amortization and terminations	(288)
Current liabilities	853
Non-current liabilities	2,161
Total Operating lease liabilities	$ 3,014	$ 2,710
Weighted average remaining lease term (years)
Operating leases	2 years 8 months 12 days
Weighted average discount rate:
Operating leases	10.02%