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Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Income Statement [Abstract]        
Revenues $ 247 $ 118 $ 519 $ 287
Cost of revenues 300 216 723 550
Gross loss (53) (98) (204) (263)
Operating expenses:        
Engineering and product development costs 3,082 1,063 5,053 2,315
Selling, general and administrative costs 2,050 1,841 4,958 3,828
Total operating expenses 5,132 2,904 10,011 6,143
Operating loss (5,185) (3,002) (10,215) (6,406)
Interest income, net 19 8 38 20
Other expense, net (33) (33)
Gain on extinguishment of PPP loan 891
Foreign exchange (loss) gain (5) 3 (5) 10
Loss before income taxes (5,171) (3,024) (9,291) (6,409)
Income tax benefit 1,041
Net loss $ (5,171) $ (3,024) $ (8,250) $ (6,409)
Basic and diluted net loss per share $ (0.10) $ (0.15) $ (0.16) $ (0.36)
Weighted average shares used to compute basic and diluted net loss per share 52,460,233 20,090,000 52,459,122 17,883,666