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Compensation Expense Related to Share-Based Compensation (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total share-based compensation expense $ 13,070 $ 10,203 $ 44,800 $ 29,070
General and Administrative        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total share-based compensation expense 8,371 6,531 23,199 18,234
Research and Development        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total share-based compensation expense $ 4,699 $ 3,672 $ 21,601 $ 10,836