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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net revenue        
Total net revenue $ 4,598 $ 1,384 $ 8,806 $ 2,596
Cost of net revenue 1,833 732 3,434 1,334
Gross profit 2,765 652 5,372 1,262
Operating expenses        
Research and development 990 2,313 2,041 5,798
Selling, general and administrative 1,250 1,101 2,239 2,415
Restructuring charges   1,002   1,002
Total operating expenses 2,240 4,416 4,280 9,215
Income (loss) from operations 525 (3,764) 1,092 (7,953)
Interest expense (206) (223) (427) (447)
Other income (expense), net (3)     13
Income (loss) before income taxes 316 (3,987) 665 (8,387)
Income tax provision 1 7 2 12
Net and comprehensive income (loss) $ 315 $ (3,994) $ 663 $ (8,399)
Net income (loss) per share        
Basic $ 0.04 $ (0.60) $ 0.08 $ (1.26)
Diluted $ 0.04 $ (0.60) $ 0.08 $ (1.26)
Shares used in computing net income (loss) per share        
Basic 8,171 6,677 8,151 6,662
Diluted 8,409 6,677 8,378 6,662
Product [Member]        
Net revenue        
Total net revenue $ 4,051 $ 1,111 $ 7,755 $ 2,066
Royalty and Other [Member]        
Net revenue        
Total net revenue $ 547 $ 273 $ 1,051 $ 530