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Collaboration and License Agreement with PTC Therapeutics - Additional Information (Details)
3 Months Ended
Aug. 01, 2018
USD ($)
Mar. 31, 2019
USD ($)
PerformanceObligation
Sep. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]        
Revenue   $ 163,816,000   $ 17,108,000
PTC Therapeutics [Member]        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]        
Revenue     $ 12,000,000  
Deferred revenue     $ 0  
Number of separate performance obligations | PerformanceObligation   2    
PTC Therapeutics [Member] | Akcea [Member]        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]        
Upfront payment received $ 12,000,000      
Payment for sublicense royalty 7,200,000      
Upfront payment to be paid on earlier of FDA or EMA approval of WAYLIVRA 6,000,000      
Maximum amount of payments receivable per drug for regulatory milestones $ 8,000,000      
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 $ 10,000,000      
TEGSEDI [Member]        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]        
Revenue   $ 6,800,000    
TEGSEDI [Member] | PTC Therapeutics [Member] | Akcea [Member]        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]        
Milestone payments and royalties retained percentage 50.00%      
TEGSEDI [Member] | PTC Therapeutics [Member] | Ionis [Member]        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]        
Milestone payments and royalties payable percentage 60.00%      
WAYLIVRA [Member] | PTC Therapeutics [Member] | Ionis [Member]        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]        
Milestone payments and royalties payable percentage 40.00%