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Stock Based Compensation Expense Recognized in Accompanying Consolidated Statements of Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Stock-based compensation $ 2,209 $ 1,250 $ 4,152 $ 2,516