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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Statement [Abstract]        
Net revenues $ 5,708,000 $ 8,953,000 $ 11,295,000 $ 17,862,000
Cost of revenues ($0, $140, $0 and $197 to a related party) 2,587,000 3,351,000 5,105,000 6,895,000
Gross profit 3,121,000 5,602,000 6,190,000 10,967,000
Operating expenses:        
Research and development 4,691,000 6,395,000 9,895,000 13,014,000
Selling, general and administrative 2,523,000 2,412,000 5,527,000 5,100,000
Total operating expenses 7,214,000 8,807,000 15,422,000 18,114,000
Loss from operations (4,093,000) (3,205,000) (9,232,000) (7,147,000)
Interest income, net 131,000 55,000 274,000 77,000
Other expense, net (60,000) (41,000) (123,000) (37,000)
Loss before income taxes (4,022,000) (3,191,000) (9,081,000) (7,107,000)
Provision for income taxes 33,000 37,000 84,000 97,000
Net loss $ (4,055,000) $ (3,228,000) $ (9,165,000) $ (7,204,000)
Net loss per share:        
Basic $ (0.16) $ (0.13) $ (0.37) $ (0.29)
Diluted $ (0.16) $ (0.13) $ (0.37) $ (0.29)
Weighted average shares used in per share calculations:        
Basic 25,161 24,554 25,014 24,538
Diluted 25,161 24,554 25,014 24,538