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Stock Based Compensation Expense Recognized in Accompanying Consolidated Statements of Operations by Category (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation $ 5,135 $ 8,725 $ 48,622
Cost of Sales      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation 695    
Research and development      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation 1,309 3,029 22,357
Selling, General and Administrative Expenses      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation $ 3,131 $ 5,696 $ 26,265