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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Net revenue        
Total net revenue $ 1,206 $ 4,343 $ 7,792 $ 13,149
Cost of net revenue 407 1,948 2,989 5,382
Gross profit 799 2,395 4,803 7,767
Operating expenses        
Research and development 1,097 1,023 3,231 3,064
Selling, general and administrative 1,059 919 2,963 3,158
Impairment of goodwill 420 3,159 420 3,159
Total operating expenses 2,576 5,101 6,614 9,381
Loss from operations (1,777) (2,706) (1,811) (1,614)
Interest expense (54) (104) (164) (531)
Other income, net 30   81  
Loss before income tax provision (1,801) (2,810) (1,894) (2,145)
Income tax provision   2   4
Net loss (1,801) (2,812) (1,894) (2,149)
Other comprehensive income, net of tax:        
Net unrealized gains on available-for-sale securities     1  
Comprehensive loss $ (1,801) $ (2,812) $ (1,893) $ (2,149)
Net loss per share        
Basic and diluted $ (0.83) $ (6.83) $ (0.88) $ (5.25)
Shares used in computing net loss per share        
Basic and diluted 2,171 412 2,161 409
Product [Member]        
Net revenue        
Total net revenue $ 1,037 $ 4,056 $ 7,233 $ 11,811
Royalty and Other [Member]        
Net revenue        
Total net revenue $ 169 $ 287 $ 559 $ 1,338