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Acquisition of 3dent Technologies, LLC - Schedule of Pro Forma Financial Information (Details) - 3Dent Acquisition [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020
Revenue | $ 1,600 | $ 2,772
Net loss | $ (14,915) | $ (10,406)
Basic and diluted net loss per share | $ (0.50) | $ (1.44)

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