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Joint Venture (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Less Than Wholly Owned Subsidiary [Abstract]    
Ownership interest in the joint venture 51.00%  
Net loss attributable to noncontrolling interest $ 0 $ 0
Registered capital of the Joint venture $ 4,000