Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020	Apr. 30, 2019
Assets
Operating lease right-of-use assets	$ 1,363	$ 2,300	$ 3,000
Liabilities
Operating lease liabilities	1,363	2,300	3,000
Current liabilities	280	1,339
Non-current liabilities	1,083	961
Total Operating lease liabilities	$ 1,363	$ 2,300	$ 3,000
Weighted average remaining lease term (years)
Operating leases	1 year 3 months 7 days	1 year 9 months 3 days
Weighted average discount rate:
Operating leases	9.27%	9.27%