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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Oct. 31, 2022
Oct. 31, 2021
Income Statement [Abstract]        
Revenues $ 303 $ 247 $ 1,017 $ 519
Cost of revenues 264 300 784 723
Gross margin (loss) 39 (53) 233 (204)
Change in fair value of contingent consideration (90) (221)
Operating expenses 6,409 5,132 12,727 10,011
Operating loss (6,280) (5,185) (12,273) (10,215)
Interest income, net 234 19 375 38
Gain on extinguishment of PPP loan 891
Other income (expense), net 1,202 1,202
Foreign exchange loss (5) (5)
Loss before income taxes (4,844) (5,171) (10,696) (9,291)
Income tax benefit 1,041
Net loss $ (4,844) $ (5,171) $ (10,696) $ (8,250)
Basic and diluted net loss per share $ (0.09) $ (0.10) $ (0.19) $ (0.16)
Weighted average shares used to compute basic and diluted net loss per share 55,898,528 52,460,233 55,894,090 52,459,122