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Summary of Significant Accounting Policies - Revenue Recognition - Condensed Statement of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Summary of Significant Accounting Policies        
Total revenue $ 10,765   $ 25,618  
Total cost of sales 6,229   11,127  
Gross profit 4,536 $ 5,792 14,491 $ 10,009
Loss from operations (7,279) (4,789) (8,389) (10,664)
Net loss and comprehensive loss $ (7,369) $ (5,187) $ (8,646) $ (11,273)
Net loss per common share, basic and diluted $ (0.44) $ (0.42) $ (0.55) $ (0.91)
Product sales        
Summary of Significant Accounting Policies        
Total revenue $ 9,449   $ 18,814  
Licensing, royalty and other revenue        
Summary of Significant Accounting Policies        
Total revenue 1,316   6,804  
ASU 2014-09 | Balances without the adoption of Topic 606        
Summary of Significant Accounting Policies        
Total revenue 10,053   24,103  
Total cost of sales 6,336   10,940  
Gross profit 3,717   13,163  
Loss from operations (8,098)   (9,717)  
Net loss and comprehensive loss $ (8,188)   $ (9,974)  
Net loss per common share, basic and diluted $ (0.49)   $ (0.63)  
ASU 2014-09 | Adjustments        
Summary of Significant Accounting Policies        
Total revenue $ (712)   $ (1,515)  
Total cost of sales 107   (187)  
Gross profit (819)   (1,328)  
Loss from operations (819)   (1,328)  
Net loss and comprehensive loss $ (819)   $ (1,328)  
Net loss per common share, basic and diluted $ (0.05)   $ (0.08)  
ASU 2014-09 | Product sales | Balances without the adoption of Topic 606        
Summary of Significant Accounting Policies        
Total revenue $ 8,863   $ 17,396  
ASU 2014-09 | Product sales | Adjustments        
Summary of Significant Accounting Policies        
Total revenue (586)   (1,418)  
ASU 2014-09 | Licensing, royalty and other revenue | Balances without the adoption of Topic 606        
Summary of Significant Accounting Policies        
Total revenue 1,190   6,707  
ASU 2014-09 | Licensing, royalty and other revenue | Adjustments        
Summary of Significant Accounting Policies        
Total revenue $ (126)   $ (97)