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Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]    
Stock-based compensation expense $ 3,244 $ 1,954
Research and Development    
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]    
Stock-based compensation expense 1,515 885
General and Administrative    
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]    
Stock-based compensation expense $ 1,729 $ 1,069