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Income Taxes - Schedule of Components of the Company's Loss Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Income Tax Disclosure [Abstract]      
Domestic $ (4,020) $ (2,110)  
Foreign (11,785) (16,493) $ (11,436)
Income before income taxes $ (15,805) $ (18,603) $ (11,436)