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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Income Statement [Abstract]    
Revenues $ 1,759 $ 1,206
Cost of revenues 1,860 2,279
Gross loss (101) (1,073)
Operating expenses 21,512 12,519
Operating loss (21,613) (13,592)
Litigation settlement (1,224)
Interest income, net 124 124
Other income 60
Gain on forgiveness of PPP loan 890
Loss on liquidation of subsidiary (157)
Other expense, net (83)
Foreign exchange (loss) / gain (1) 15
Loss before income taxes (20,697) (14,760)
Income tax benefit 1,823
Net loss $ (18,874) $ (14,760)
Basic and diluted net loss per share $ (0.35) $ (0.49)
Weighted average shares used to compute basic and diluted net loss per share 54,010,233 30,018,838