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Collaboration Agreements - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended 12 Months Ended 34 Months Ended
Mar. 31, 2014
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2016
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Revenue recognized under collaboration agreement   $ 16,282,000 $ 5,139,000 $ 18,581,000 $ 7,700,000      
Estimated deferred revenue recognized within one year   17,067,000   17,067,000     $ 19,033,000 $ 19,033,000
Merck Sharp & Dohme Corp. | Maximum                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Proceeds from Collaborators       12,000,000        
Collaborative Arrangement [Member] | Celgene Corporation                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Maximum success-based milestone payments $ 17,000,000              
Minimum annual revenue period 3 years              
Deferred revenue recorded under collaboration agreement   5,000,000   5,000,000        
Estimated deferred revenue recognized within one year   1,700,000   $ 1,700,000        
Collaborative agreement period       1 year        
License and Services Revenue   500,000 900,000 $ 600,000 1,700,000      
Collaborative Arrangement [Member] | Celgene Corporation | Maximum                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Maximum success-based milestone payments $ 45,000,000              
Collaborative Arrangement [Member] | Celgene Corporation | Upfront Payment Arrangement                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Collaboration agreement upfront payment $ 5,800,000             $ 2,100,000
Proceeds from Collaborators             6,000,000  
Collaborative Arrangement [Member] | Merck Sharp & Dohme Corp.                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Deferred revenue recorded under collaboration agreement   18,800,000   18,800,000        
Proceeds from Collaborators   1,500,000 2,000,000 $ 3,300,000 3,900,000      
Collaborative Arrangement [Member] | Merck Sharp & Dohme Corp. | Upfront Payment Arrangement                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Proceeds from Collaborators           $ 3,900,000 12,000,000  
License and Services Revenue             $ 8,500,000  
Collaborative Arrangement [Member] | Medivation, Inc. and Astellas Pharma, Inc.                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Revenue recognized under collaboration agreement         0      
Collaborative agreement period       1 year        
License and Services Revenue   11,300,000 1,500,000   2,100,000      
Gain (Loss) on Contract Termination   1,000,000            
Collaborative Arrangement [Member] | Medivation, Inc. and Astellas Pharma, Inc. | Maximum                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
License and Services Revenue       $ 11,100,000        
Clinical Research Collaborative Arrangement | Merck Sharp & Dohme Corp.                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Estimated deferred revenue recognized within one year   11,700,000   $ 11,700,000        
Collaborative agreement period       1 year        
License and Services Revenue   4,500,000 $ 2,600,000 $ 6,600,000 $ 3,900,000      
Clinical Research Collaborative Arrangement | Medivation, Inc. and Astellas Pharma, Inc.                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Estimated deferred revenue recognized within one year   $ 300,000   $ 300,000