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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

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