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Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Income Statement [Abstract]        
Revenues $ 118 $ 204 $ 287 $ 406
Cost of revenues 216 288 550 655
Gross loss (98) (84) (263) (249)
Operating expenses:        
Engineering and product development costs 1,063 1,309 2,315 2,507
Selling, general and administrative costs 1,841 1,838 3,828 3,534
Total operating expenses 2,904 3,147 6,143 6,041
Operating loss (3,002) (3,231) (6,406) (6,290)
Gain due to the change in fair value of warrant liabilities 6
Interest income, net 8 32 20 74
Other expense, net (33) (33)
Foreign exchange gain/(loss) 3 10 10 (4)
Net loss $ (3,024) $ (3,189) $ (6,409) $ (6,214)
Basic and diluted net loss per share $ (0.15) $ (0.51) $ (0.36) $ (1.01)
Weighted average shares used to compute basic and diluted net loss per share 20,090,000 6,259,255 17,883,666 6,150,061