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Schedule of Amortization of Premium and Accretion of Debt Issuance Costs Related to Related Party Notes (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Related Party Transaction [Line Items]        
Amortization of debt premium $ 385 $ 686 $ 698 $ 1,133
Related Party Notes        
Related Party Transaction [Line Items]        
Amortization of debt premium 57 61 67 120
Accretion expense - debt issuance cost $ 6 $ 6 $ 8 $ 8