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Collaborative Arrangements and Licensing Agreements, Traditional Pharmaceutical Alliances and Licensing - Biogen Idec (Strategic Neurology) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2015
Sep. 30, 2013
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Collaborative Arrangement and Licensing Agreement [Abstract]            
Revenue earned     $ 120,428 $ 57,076 $ 183,012 $ 85,237
Biogen Idec [Member] | Collaborations and Licensing Agreements [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Revenue earned     17,800 $ 34,500 57,000 $ 44,700
Deferred revenue     $ 105,000   $ 105,000  
Biogen Idec [Member] | Collaborations and Licensing Agreements [Member] | Revenue [Member] | Strategic Partner [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Concentration percentage     15.00%   31.00%  
Biogen Idec [Member] | Agreement Entered into in September 2013 [Member] | Strategic Neurology [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Upfront fee recorded as deferred revenue   $ 100,000        
Period during which a change in control could result in requirement to refund upfront payment         6 years  
Cumulative payments received     $ 135,000   $ 135,000  
Milestone payment earned $ 10,000          
Biogen Idec [Member] | Agreement Entered into in September 2013 [Member] | Strategic Neurology [Member] | Maximum [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Next prospective milestone     10,000   10,000  
Biogen Idec [Member] | Agreement Entered into in September 2013 [Member] | Strategic Neurology [Member] | Antisense Drug for Neurological Disease [Member] | License Fee and Substantive Milestones [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Maximum amount of payment receivable per drug     260,000   260,000  
Biogen Idec [Member] | Agreement Entered into in September 2013 [Member] | Strategic Neurology [Member] | Antisense Drug for Neurological Disease [Member] | Research and Development Milestones [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Maximum amount of payment receivable per drug     60,000   60,000  
Biogen Idec [Member] | Agreement Entered into in September 2013 [Member] | Strategic Neurology [Member] | Antisense Drug for Neurological Disease [Member] | Regulatory Milestones [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Maximum amount of payment receivable per drug     130,000   130,000  
Biogen Idec [Member] | Agreement Entered into in September 2013 [Member] | Strategic Neurology [Member] | Other Modalities [Member] | Pre-specified Events [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Maximum amount of payment receivable per drug     90,000   90,000  
Biogen Idec [Member] | Agreement Entered into in September 2013 [Member] | Strategic Neurology [Member] | Other Modalities [Member] | Research and Development Milestones [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Maximum amount of payment receivable per drug     35,000   35,000  
Biogen Idec [Member] | Agreement Entered into in September 2013 [Member] | Strategic Neurology [Member] | Other Modalities [Member] | Regulatory Milestones [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Maximum amount of payment receivable per drug     $ 55,000   $ 55,000