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Significant Collaboration and Licensing Agreements - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended 55 Months Ended 112 Months Ended
Jan. 31, 2019
Feb. 28, 2017
Mar. 31, 2015
Jun. 30, 2010
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2019
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                        
Restricted investment in equity securities fair value amount         $ 48,915       $ 48,915   $ 48,915 $ 48,915
Acquired in-process research and development                 118,081      
Revenues         222,094     $ 151,757 544,077 $ 319,748    
Collaboration revenue                        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                        
Revenues         24,000     $ 40,466 29,008 $ 40,466    
Voyager Therapeutics | Collaboration and License Agreement                        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                        
Upfront payments made $ 115,000                      
Restricted investment in equity securities cost $ 50,000                      
Share price $ 11.9625                      
Restricted investment in equity securities fair value amount             $ 54,700          
Collaboration termination notice period 180 days                      
Voyager Therapeutics | Collaboration and License Agreement | IPR&D                        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                        
Acquired in-process research and development           $ 5,000 $ 113,100          
Voyager Therapeutics | Collaboration and License Agreement | Common Stock                        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                        
Restricted investment in equity securities number of shares 4.2                      
Voyager Therapeutics | Collaboration and License Agreement | Development, Regulatory and Commercial Milestone Payment                        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                        
Potential milestone payments $ 1,700,000                      
B I A L                        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                        
Upfront payments made   $ (30,000)                    
Potential payments for regulatory milestones   40,000                    
Potential payments for commercial milestones   $ 75,000                    
B I A L | Regulatory and Clinical Results and FDA Acceptance Milestones                        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                        
Payments made for regulatory milestones         10,000       10,000   10,000 10,000
B I A L | Development and Regulatory Milestone Payments                        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                        
Payments made for regulatory milestones         20,000       $ 20,000   20,000 20,000
Mitsubishi Tanabe                        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                        
Upfront payments received     $ 30,000               30,000  
Potential milestone payment receipts     85,000                  
Deferred revenues     10,200                  
Mitsubishi Tanabe | Collaboration revenue                        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                        
Revenues     $ 19,800               $ 15,000  
AbbVie                        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                        
Potential payments for commercial milestones       $ 50,000                
Upfront payments received       75,000                
Potential development and regulatory milestone payment receipts       $ 480,000                
AbbVie | Collaboration revenue                        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                        
Revenues         $ 20,000             $ 135,000