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Collaboration Agreements - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2015
Oct. 31, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Maximum success-based milestone payments   $ 55,000            
Amount of certain milestones achieved in account receivable       $ 13,217   $ 13,217   $ 12,436
Revenue recognized under collaboration agreement       568 $ 618 1,329 $ 618  
Revenue recognized under collaboration agreement       5,678   5,678   4,627
Celgene Corporation [Member] | Collaborative Arrangement [Member]                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Amount of certain milestones achieved in account receivable               $ 6,000
Revenue recognized under collaboration agreement       300 600 1,000 600  
Deferred revenue recorded under collaboration agreement       7,800   7,800    
Celgene Corporation [Member] | Upfront Payment Arrangement [Member] | Collaborative Arrangement [Member]                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Collaboration agreement upfront payment     $ 5,800          
Celgene Corporation [Member] | Scenario, Forecast [Member] | Collaborative Arrangement [Member]                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Revenue recognized under collaboration agreement       1,700   1,700    
Merck Sharp & Dohme Corp. [Member] | Clinical Research Collaborative Arrangement [Member]                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Revenue recognized under collaboration agreement       200 $ 0 200 $ 0  
Deferred revenue recorded under collaboration agreement       $ 2,100   $ 2,100    
Collaborative agreement period           1 year    
Merck Sharp & Dohme Corp. [Member] | Upfront Payment Arrangement [Member] | Clinical Research Collaborative Arrangement [Member] | Subsequent Event [Member]                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Collaboration agreement upfront payment $ 2,000              
Maximum [Member] | Celgene Corporation [Member] | Scenario, Forecast [Member] | Collaborative Arrangement [Member]                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Maximum success-based milestone payments           $ 17,000    
Maximum [Member] | Merck Sharp & Dohme Corp. [Member] | Clinical Research Collaborative Arrangement [Member]                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Maximum success-based milestone payments           $ 4,000