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Collaboration Revenue - Comparison of Reported Condensed Consolidated Statement of Operations to Pro-forma Amounts (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Collaboration revenue - related party $ 3,766 $ 3,015
Loss from operations (28,266) (25,890)
Net loss $ (27,919) $ (25,474)
Net loss per share attributable to common stockholders, basic and diluted $ (0.69) $ (0.63)
Previous Accounting in Effect [Member] | ASU 2014-09 [Member] | Pro Forma [Member]    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Collaboration revenue - related party $ 3,059  
Loss from operations (28,973)  
Net loss $ (28,626)  
Net loss per share attributable to common stockholders, basic and diluted $ (0.70)