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Significant agreements - Additional Information (Detail) - Celgene Corporation [Member]
$ in Millions
12 Months Ended
Jun. 03, 2015
USD ($)
Deliverables
Mar. 19, 2013
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Feb. 17, 2016
USD ($)
Feb. 16, 2016
USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]              
Term of collaboration agreement   3 years          
First Product Candidates [Member]              
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]              
Amount per product eligible to be received upon achievement of specified event $ 10.0            
Amount paid per product upon achievement of specified event             $ 10.0
Additional Product Candidates [Member]              
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]              
Amount per product eligible to be received upon achievement of specified event $ 15.0            
Co-Develop and Co-Promote Options not Exercise [Member]              
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]              
Amount per product eligible to be received upon achievement of specified event           $ 10.0  
Collaborative Arrangement [Member]              
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]              
Number of deliverable | Deliverables 3            
Consideration allocated to agreement     $ 109.0        
Deferred revenue recognition period     3 years        
Deferred revenue recognized     $ 6.2 $ 14.1 $ 25.0    
Deferred revenue     46.4 $ 41.8      
Deferred revenue expected to be recognized     8.8        
Collaborative Arrangement [Member] | Option Fee [Member]              
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]              
Amount per product eligible to be received upon achievement of specified event     10.0        
Collaborative Arrangement [Member] | Delivered Elements [Member]              
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]              
Collaboration agreement, cash payment received $ 20.0            
Consideration allocated to agreement     17.3        
Up-front Payment Arrangement [Member] | Collaborative Arrangement [Member]              
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]              
Collaboration agreement, cash payment received   $ 75.0 25.0        
Up-front Payment Arrangement [Member] | Amended Collaborative Arrangement [Member]              
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]              
Collaboration agreement, cash payment received $ 25.0            
Manufacturing Services [Member] | Collaborative Arrangement [Member]              
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]              
Amount per product eligible to be received upon achievement of specified event     91.7        
Consideration allocated to agreement     $ 54.1