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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 6 Months Ended
Feb. 28, 2017
Mar. 31, 2015
Jun. 30, 2010
Mar. 31, 2019
Jun. 30, 2019
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]          
Equity investment fair value amount         $ 77,365
Voyager Therapeutics | Collaboration and License Agreement          
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]          
Up-front cash payable         115,000
Collaborative agreement equity investment amount         $ 50,000
Share price         $ 11.9625
Equity investment 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]          
Up-front cash payable         $ 5,000
Collaborative agreement remaining purchase price       $ 113,100  
Voyager Therapeutics | Collaboration and License Agreement | Common Stock          
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]          
Common stock issued for collaboration agreement         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]          
Up-front license fees $ (30,000)        
B I A L | Regulatory and Clinical Results and FDA Acceptance Milestones          
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]          
Potential milestone payments         10,000
B I A L | Development and Regulatory Milestone Payments          
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]          
Collaborative agreement maximum additional payment to receive         40,000
Collaborative agreement payment received         10,000
B I A L | Commercial Milestone Payments          
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]          
Collaborative agreement maximum additional payment to receive         75,000
Mitsubishi Tanabe          
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]          
Up-front license fees   $ 30,000      
Collaborative agreement maximum additional payment to receive   85,000      
Revenues recognized under collaboration agreement   19,800      
Deferred revenues under collaboration   10,200      
Mitsubishi Tanabe | Phase II/III Clinical Trials          
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]          
Revenues recognized under collaboration agreement   $ 15,000      
AbbVie          
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]          
Up-front license fees     $ 75,000    
AbbVie | Development and Regulatory Milestone Payments          
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]          
Collaborative agreement maximum additional payment to receive         480,000
Collaborative agreement payment received         115,000
AbbVie | Commercial Milestone Payments          
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]          
Collaborative agreement maximum additional payment to receive         $ 50,000