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Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense $ 9,349 $ 6,290 $ 15,519 $ 11,089
Inventory        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense 489   1,061  
Research and Development        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense 1,976 2,674 4,156 4,862
Selling, General and Administrative        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense 2,470 2,997 5,550 5,585
Restructuring        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense 4,122   4,122  
Cost of Sales - Product        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense $ 292 $ 619 $ 630 $ 642