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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net revenue      
Total net revenue $ 10,086 $ 16,600 $ 8,842
Cost of net revenue 3,931 6,346 4,694
Gross profit 6,155 10,254 4,148
Operating expenses      
Research and development 4,182 4,129 8,158
Selling, general and administrative 4,016 4,095 4,702
Impairment of goodwill 420 12,856  
Restructuring charges     1,321
Total operating expenses 8,618 21,080 14,181
Loss from operations (2,463) (10,826) (10,033)
Interest expense (220) (582) (927)
Other income, net 103 12 59
Loss before income taxes (2,580) (11,396) (10,901)
Income tax provision (benefit) 0 13 (233)
Net loss $ (2,580) $ (11,409) $ (10,668)
Net loss per share      
Basic and diluted $ (1.19) $ (14.82) $ (29.07)
Shares used in computing net loss per share      
Basic and diluted 2,165 770 367
Product [Member]      
Net revenue      
Total net revenue $ 9,377 $ 15,053 $ 7,833
Royalty and Other [Member]      
Net revenue      
Total net revenue $ 709 $ 1,547 $ 1,009