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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Related Party Transaction [Line Items]        
Amortization of debt premium $ 375 $ 431 $ 1,072 $ 1,564
Related Party Notes        
Related Party Transaction [Line Items]        
Amortization of debt premium 59   125  
Accretion expense - debt issuance cost $ 6   $ 13