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Financial Instruments - Schedule of Maintenance Fee Payment to CCKF (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]        
Maintenance Fee Payments $ 356 $ 340 $ 1,013 $ 1,027