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Leases - Schedule of Right-of Use Assets and Lease Liabilities (Details) - USD ($)
$ in Thousands
Apr. 30, 2021
Apr. 30, 2020
Leases [Abstract]    
Operating right-of-use asset, net $ 1,036 $ 1,165
Right-of-use liability- current 495 229
Right-of-use liability- long term 819 $ 1,078
Total lease liability $ 1,166  
Weighted average remaining lease term- operating leases 3 years 4 months 2 days  
Weighted average discount rate- operating leases 8.10%