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Income Taxes - Schedule of Components of Loss Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Income Tax Disclosure [Abstract]    
Domestic $ (10,985) $ (12,860)
Foreign (262) (236)
Total loss before income taxes $ (11,247) $ (13,096)