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Schedule of Interest Expense on Note Payable to Principal Stockholder (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Related Party Transactions [Abstract]        
Interest expense on note payable to principal stockholder $ 1,173 $ 729 $ 2,608 $ 2,172