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Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense $ 2,630 $ 1,586 $ 6,502 $ 4,532
Research and Development        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense 1,232 731 2,985 2,161
General and Administrative        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense $ 1,398 $ 855 $ 3,517 $ 2,371