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Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Income Statement [Abstract]
Revenues	$ 1,682	$ 632
Cost of revenues	1,787	1,303
Gross loss	(105)	(671)
Operating expenses:
Engineering and product development costs	4,344	4,984
Selling, general and administrative costs	6,916	7,616
Total operating expenses	11,260	12,600
Operating loss	(11,365)	(13,271)
Gain due to the change in fair value of warrant liabilities	6	195
Interest income, net	124	35
Foreign exchange loss	(12)	(55)
Loss before income taxes	(11,247)	(13,096)
Income tax benefit	895	850
Net loss	$ (10,352)	$ (12,246)
Basic and diluted net loss per share	$ (1.44)	$ (9.52)
Weighted average shares used to compute basic and diluted net loss per share	7,209,732	1,286,727

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