Significant Agreements (Narrative) (Details)
1 Months Ended 12 Months Ended 22 Months Ended 25 Months Ended
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 1999
USD ($)
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Debt And Credit Agreements [Line Items]                
Number of Patents | item     2          
Cost incurred under the agreement     $ 15,419,000 $ 18,372,000 $ 20,470,000      
Stanford license agreement                
Debt And Credit Agreements [Line Items]                
Issuance of common stock in conjunction with a license agreement | shares           30,000    
Stanford license agreement | Annual Payment                
Debt And Credit Agreements [Line Items]                
Royalty payments to be made           $ 50,000    
Centric Health Resources, Inc.                
Debt And Credit Agreements [Line Items]                
Initial agreement period     3 years          
Agreement termination, written notice period     180 days          
Agreement with PCAS                
Debt And Credit Agreements [Line Items]                
Initial agreement period     5 years          
Automatic extension period     1 year          
Agreement termination, written notice period     12 months          
Right to terminate agreement if unable to manufacture product, period     9 months          
Agreement with AAI Pharma [Member]                
Debt And Credit Agreements [Line Items]                
Initial agreement period     3 years          
Automatic extension period     2 years          
Agreement termination, written notice period     12 months          
Termination notice period for manufacturer     18 months          
Right to terminate agreement if unable to manufacture product, period     4 months          
Purchase obligations     $ 0       $ 0 $ 0
Quotient Clinical Limited [Member]                
Debt And Credit Agreements [Line Items]                
Initial agreement period     1 year          
Commitment amount related to service agreement $ 3,000,000              
Cost incurred under the agreement             $ 2,900,000  
Chiltern [Member]                
Debt And Credit Agreements [Line Items]                
Commitment amount related to service agreement   $ 3,100,000            
Cost incurred under the agreement               $ 2,400,000