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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]      
Net revenues $ 27,729 $ 43,343 $ 51,486
Cost of revenues 14,512 18,000 19,858
Gross profit 13,217 25,343 31,628
Operating expenses:      
Research and development 23,344 25,223 21,355
Selling, general and administrative 11,137 10,922 10,455
Total operating expenses 34,481 36,145 31,810
Loss from operations (21,264) (10,802) (182)
Interest income, net 295 783 671
Other expense, net (201) (71) (221)
Income (loss) before income taxes (21,170) (10,090) 268
Provision for income taxes 335 247 105
Net income (loss) $ (21,505) $ (10,337) $ 163
Net income (loss) per share:      
Basic $ (0.91) $ (0.45) $ 0.01
Diluted $ (0.91) $ (0.45) $ 0.01
Weighted average shares used in per share calculations:      
Basic 23,671 22,968 21,889
Diluted 23,671 22,968 23,349