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Acquisitions - Narrative, Docetaxel (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 12, 2016
Oct. 13, 2015
Mar. 31, 2017
Mar. 31, 2016
Jan. 31, 2016
Business Acquisition [Line Items]          
Payments to acquire business     $ 0 $ 4,850  
Product sales     15,286 14,122  
Net loss     (22,924) $ 896  
Non-Alcohol Docetaxel Injection          
Business Acquisition [Line Items]          
Total consideration $ 11,220        
Non-Alcohol Docetaxel Injection | Docetaxel product rights          
Business Acquisition [Line Items]          
Payments to acquire business $ 4,850 $ 250      
Royalties on Gross Profits | Non-Alcohol Docetaxel Injection | Docetaxel product rights          
Business Acquisition [Line Items]          
Contingent consideration, percentage of gross profits 25.00%       25.00%
Non-Alcohol Docetaxel Injection          
Business Acquisition [Line Items]          
Product sales     1,432    
Net loss     $ 2,503