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Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense $ 6,290 $ 3,363 $ 11,089 $ 7,184
Research and Development        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense 2,674 1,771 4,862 3,734
Selling, General and Administrative        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense 2,997 $ 1,592 5,585 $ 3,450
Cost of Sales - Product        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense $ 619   $ 642