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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net revenue        
Total net revenue $ 4,343 $ 2,453 $ 13,149 $ 5,049
Cost of net revenue 1,948 1,256 5,382 2,590
Gross profit 2,395 1,197 7,767 2,459
Operating expenses        
Research and development 1,023 1,436 3,064 7,234
Selling, general and administrative 919 1,244 3,158 3,659
Impairment of goodwill 3,159   3,159  
Restructuring charges   50   1,052
Total operating expenses 5,101 2,730 9,381 11,945
Loss from operations (2,706) (1,533) (1,614) (9,486)
Interest expense (104) (238) (531) (685)
Other income, net   32   45
Loss before income taxes (2,810) (1,739) (2,145) (10,126)
Income tax provision 2 4 4 16
Net and comprehensive loss $ (2,812) $ (1,743) $ (2,149) $ (10,142)
Net loss per share        
Basic and diluted $ (0.34) $ (0.22) $ (0.26) $ (1.43)
Shares used in computing net loss per share        
Basic and diluted 8,240 7,938 8,181 7,092
Product [Member]        
Net revenue        
Total net revenue $ 4,056 $ 2,231 $ 11,811 $ 4,297
Royalty and Other [Member]        
Net revenue        
Total net revenue $ 287 $ 222 $ 1,338 $ 752