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Leases - Schedule of Right-of Use Assets and Lease Liabilities (Details) - USD ($)
$ in Thousands
Oct. 31, 2020
Apr. 30, 2020
Leases [Abstract]    
Operating right-of-use asset, net $ 1,060 $ 1,165
Right-of-use liability- current 244 229
Right-of-use liability- long term 954 $ 1,078
Total lease liability $ 1,198  
Weighted average remaining lease term- operating leases 3 years 11 months 23 days  
Weighted average discount rate- operating leases 8.50%