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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Net revenue    
Total net revenue $ 1,260 $ 3,520
Cost of net revenue 530 1,354
Gross profit 730 2,166
Operating expenses    
Research and development 961 1,153
Selling, general and administrative 1,135 972
Total operating expenses 2,096 2,125
Income (loss) from operations (1,366) 41
Interest expense (55) (54)
Other income, net 16 23
Income (loss) before income tax provision (1,405) 10
Net income (loss) $ (1,405) $ 10
Net income (loss) per share    
Basic $ (0.61) $ 0.00
Diluted $ (0.61) $ 0.00
Shares used in computing net income (loss) per share    
Basic 2,295 2,153
Diluted 2,295 2,271
Product [Member]    
Net revenue    
Total net revenue $ 1,068 $ 3,386
Royalty and Other [Member]    
Net revenue    
Total net revenue $ 192 $ 134