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Collaborative Arrangements (Details) - USD ($)
1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended
Apr. 30, 2016
Sep. 30, 2015
Aug. 31, 2015
Jul. 31, 2014
Feb. 29, 2012
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Technology Transfer, Collaboration and License Agreement [Member]                      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                      
Termination notice period     30 days                
GlaxoSmithKline [Member]                      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                      
Proceeds from license fees received       $ 6,000,000              
Revenue recognized $ 7,500,000 $ 6,500,000           $ 5,000,000      
Minimum milestone receivable           $ 5,750,000.00          
Maximum milestone receivable           38,500,000.0          
Termination notice period       90 days              
Term of milestone agreement       3 years              
License and services revenue           0 $ 500,000   $ 3,000,000 $ 1,500,000  
Deferred revenue           0     0   $ 3,000,000
Merck [Member] | Technology Transfer, Collaboration and License Agreement [Member]                      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                      
Proceeds from license fees received     $ 5,000,000                
Revenue recognized   $ 5,000,000                  
Estimated proceeds           8,000,000     8,000,000    
Termination notice period     90 days                
License and services revenue           600,000 $ 400,000   1,900,000 400,000  
Deferred revenue           2,100,000     2,100,000   4,000,000
Upfront License fee, period for recognition     2 years                
Potential royalty revenue           15,000,000          
Duration of license agreement             3 years        
Right of refusal period     5 years                
Merck [Member] | Supply Agreement [Member]                      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                      
Termination notice period         24 months            
License and services revenue           300,000 $ 500,000   1,000,000 $ 1,500,000  
Deferred revenue           $ 1,700,000     $ 1,700,000   $ 1,000,000
Upfront License fee, period for recognition         5 years            
Term of collaborative research and development agreement (years)         5 years            
Optional extension period         5 years