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Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense $ 3,124 $ 1,918 $ 6,368 $ 3,872
Research and Development        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense 1,336 868 2,851 1,753
General and Administrative        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense $ 1,788 $ 1,050 $ 3,517 $ 2,119