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Accrued Expenses and Other Current Liabilities - Additional Information (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accrued Expenses And Other Current Liabilities [Line Items]    
Accrued salary and related expenses $ 6,951 $ 7,260
Selling, General and Administrative Costs    
Accrued Expenses And Other Current Liabilities [Line Items]    
Accrued salary and related expenses $ 1,000