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Stock-Based Compensation - Stock-Based Compensation Expense Related to Option Awards (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 [Line Items]        
Stock based compensation expense $ 2,711 $ 55 $ 2,745 $ 146
Research and Development [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense 50 40 81 105
General and Administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense $ 2,661 $ 15 $ 2,664 $ 41