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Intangible assets, net (Details) - USD ($)
3 Months Ended 6 Months Ended
Aug. 28, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Intangible assets disclosures            
Intangible assets, excluding patents, gross   $ 22,756,000   $ 22,756,000   $ 22,756,000
Accumulated amortization   (5,336,000)   (5,336,000)   (4,589,000)
Intangible assets, excluding patents, net   17,420,000   17,420,000   18,167,000
Amortization of Intangible Assets, Excluding Patents       747,000 $ 404,000  
Proprietary modified-release drug delivery technology            
Intangible assets disclosures            
Intangible assets, excluding patents, gross   15,600,000   $ 15,600,000   15,600,000
Useful life       20 years    
Amortization of Intangible Assets, Excluding Patents   195,000 $ 195,000 $ 390,000 390,000  
Tussionex ANDA            
Intangible assets disclosures            
Intangible assets, excluding patents, gross   4,829,000   4,829,000   4,829,000
Payment made to acquire asset $ 4,200,000          
Legal fees 90,000          
Earnout fair value 589,000          
Decrease in the value because of reclassification from Schedule III to Schedule II       400,000    
Tussionex ANDA | Other income (expense)            
Intangible assets disclosures            
Increase (decrease) in fair value of earnout liability   42,000        
CPI Profit Sharing            
Intangible assets disclosures            
Intangible assets, excluding patents, gross   2,043,000   2,043,000   2,043,000
Payment made to acquire asset 2,000,000          
Legal fees $ 43,000          
Other            
Intangible assets disclosures            
Intangible assets, excluding patents, gross   284,000   284,000   $ 284,000
Tussionex ANDA and CPI profit sharing            
Intangible assets disclosures            
Useful life 10 years          
Amortization of Intangible Assets, Excluding Patents   $ 171,000 $ 0 $ 343,000 $ 0