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Collaborative Arrangements and Licensing Agreements, PTC Therapeutics (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2018
USD ($)
PerformanceObligation
May 31, 2015
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Collaborative Arrangement and Licensing Agreement [Abstract]            
Revenue   $ 91,200   $ 599,674 $ 514,179 $ 372,776
Deferred revenue         233,362  
PTC Therapeutics [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Number of separate performance obligations | PerformanceObligation 2          
Deferred revenue       0 $ 0  
PTC Therapeutics [Member] | Sublicense Revenue [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Revenue     $ 7,200      
Akcea [Member] | PTC Therapeutics [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Payment receivable under license agreement       26,000    
Payment received under license agreement     $ 12,000      
Payment to be received on earlier of FDA or EMA approval of WAYLIVRA       6,000    
Maximum amount of payments receivable per drug for regulatory milestones       $ 8,000    
Royalty percentage received on net sales of each drug in Latin America from PTC       20.00%    
Period before PTC pays royalties on net sales of product after first commercial sale in Brazil       12 months    
Minimum revenue recognized in Latin America by PTC before paying royalties       $ 10,000    
Akcea [Member] | PTC Therapeutics [Member] | License Fees [Member]            
Collaborative Arrangement and Licensing Agreement [Abstract]            
Revenue $ 12,000