CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Net revenues	$ 8,909,000	$ 8,791,000
Cost of revenues ($57 and $13 to a related party)	3,544,000	4,009,000
Gross profit	5,365,000	4,782,000
Operating expenses:
Research and development	6,619,000	6,103,000
Selling, general and administrative	2,688,000	3,040,000
Total operating expenses	9,307,000	9,143,000
Loss from operations	(3,942,000)	(4,361,000)
Interest income, net	22,000	23,000
Other income (expense), net	4,000	(43,000)
Loss before income taxes	(3,916,000)	(4,381,000)
Provision (benefit) for income taxes	60,000	(172,000)
Net loss	$ (3,976,000)	$ (4,209,000)
Net loss per share:
Basic	$ (0.16)	$ (0.17)
Diluted	$ (0.16)	$ (0.17)
Weighted average shares used in per share calculations:
Basic	24,523	24,095
Diluted	24,523	24,095