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Related Party Transactions - Additional Information (Detail) (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Principal Owner [Member]  
Related Party Transaction [Line Items]  
Rent Expense $ 334
Principal Owner [Member] | Minimum  
Related Party Transaction [Line Items]  
Non controlling ownership interest minimum 10.00%
Director [Member]  
Related Party Transaction [Line Items]  
Accrued expenses related to director service $ 190