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Fair Value of Financial Instruments - Aggregate Fair Value and Carrying Value of Long-term Debt (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Debt Instruments [Abstract]  
Long-term debt - related party, Fair Value $ 1,295
Long-term debt, Fair Value 1,295
Total long-term debt, Fair Value 2,590
Long-term debt - related party, Carrying Value 1,295
Long-term debt, Carrying Value 1,295
Total long-term debt, Carrying Value $ 2,590