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Stock-Based Compensation Recognized on Condensed Consolidated Statements of Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense $ 1,704 $ 1,341 $ 3,179 $ 2,286
Research and Development Expense        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense 340 276 623 459
Selling, General and Administrative Expenses        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense $ 1,364 $ 1,065 $ 2,556 $ 1,827