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Property and Equipment - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Property, Plant and Equipment [Abstract]    
Depreciation and amortization $ 606 $ 360
Decrease in property and equipment   16
Gain on disposal   3
Capital lease asset 366 130
Capital leases, income statement, amortization expense $ 116 $ 27