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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2023
Jan. 31, 2022
Jan. 31, 2023
Jan. 31, 2022
Income Statement [Abstract]        
Revenues $ 734 $ 484 $ 1,752 $ 1,003
Cost of revenues 598 597 1,382 1,320
Gross margin (loss) 136 (113) 370 (317)
(Gain)/loss from change in fair value of consideration 373 (60) 154 (60)
Operating expenses 6,820 5,439 19,546 15,451
Operating loss (7,057) (5,492) (19,330) (15,708)
Interest income, net 229 16 604 56
Other income, proceeds from insurance claim 458 458
Other income, employee retention credit 1,202
Gain on extinguishment of PPP loan 890
Foreign exchange gain 2 5 2
Loss before income taxes (6,368) (5,471) (17,064) (14,762)
Income tax benefit 278 278 1,041
Net loss $ (6,090) $ (5,471) $ (16,786) $ (13,721)
Basic and diluted net loss per share $ (0.11) $ (0.10) $ (0.30) $ (0.26)
Weighted average shares used to compute basic and diluted net loss per common share 55,966,672 55,308,799 55,918,284 53,408,998