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Summary of significant accounting policies (Details)
6 Months Ended
Jun. 30, 2015
USD ($)
segment
subsidiary
product
Jun. 29, 2015
Dec. 31, 2014
USD ($)
subsidiary
Oct. 06, 2014
USD ($)
Significant accounting policies disclosures        
Uncertain tax positions $ 0   $ 0  
Deferred tax assets, net of valuation allowance $ 0   0  
Net operating loss carry-forward     86,551,000  
Number of operating segments | segment 1      
Minimum number of product candidate launches anticipated before profitability anticipated | product 1      
Research and development credits        
Significant accounting policies disclosures        
Tax credit carry-forward     $ 2,029,000  
Minimum        
Significant accounting policies disclosures        
Intangible asset - useful life 10 years      
Maximum        
Significant accounting policies disclosures        
Intangible asset - useful life 20 years      
Neostx, Inc. ("NTX")        
Significant accounting policies disclosures        
Ownership acquired (as a percent)   0.10%    
Third party logistics provider - 3PL        
Significant accounting policies disclosures        
Inventory labeled as Schedule III controlled substance that is solely located at the third party logistics provider (does not include inventory at wholesalers)       $ 0
Wholly-owned subsidiaries        
Significant accounting policies disclosures        
Number of wholly-owned subsidiaries | subsidiary 2   2  
Percentage ownership by parent (as a percent) 100.00%   100.00%  
Neostx, Inc. ("NTX")        
Significant accounting policies disclosures        
Percentage ownership by parent (as a percent)     99.90%