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Income Taxes - Schedule of Components of Loss Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Income Tax Disclosure [Abstract]    
Domestic $ (14,392) $ (10,985)
Foreign (368) (262)
Total loss before income taxes $ (14,760) $ (11,247)