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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Income Statement [Abstract]        
Net revenues $ 8,065,000 $ 6,763,000 $ 24,653,000 $ 20,043,000
Cost of revenues 3,603,000 3,566,000 11,232,000 10,684,000
Gross profit 4,462,000 3,197,000 13,421,000 9,359,000
Operating expenses:        
Research and development 6,152,000 5,736,000 18,162,000 17,220,000
Selling, general and administrative 2,842,000 2,612,000 8,669,000 8,138,000
Total operating expenses 8,994,000 8,348,000 26,831,000 25,358,000
Loss from operations (4,532,000) (5,151,000) (13,410,000) (15,999,000)
Interest income, net 20,000 50,000 60,000 244,000
Other expense, net (5,000) (25,000) (73,000) (129,000)
Loss before income taxes (4,517,000) (5,126,000) (13,423,000) (15,884,000)
Provision (benefit) for income taxes 64,000 90,000 (66,000) 639,000
Net loss $ (4,581,000) $ (5,216,000) $ (13,357,000) $ (16,523,000)
Net loss per share:        
Basic $ (0.19) $ (0.22) $ (0.55) $ (0.70)
Diluted $ (0.19) $ (0.22) $ (0.55) $ (0.70)
Weighted average shares used in per share calculations:        
Basic 24,406 23,716 24,244 23,592
Diluted 24,406 23,716 24,244 23,592