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Financial Instruments - Schedule of Maintenance Fee Payment to CCKF (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Related Party Transactions [Abstract]        
Maintenance Fee Payments $ 332 $ 345 $ 657 $ 687