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Schedule of Interest Expense on Note Payable to Principal Stockholder (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Related Party Transaction [Line Items]        
Interest expense on note payable to principal stockholder $ 721 $ 721 $ 1,435 $ 1,443