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Related-party Transactions (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]    
Due from Related Parties, Current $ 3,250 $ 7,150
VST [Member]    
Related Party Transaction [Line Items]    
Due from Related Parties, Current 2,750 7,150
Emza [Member]    
Related Party Transaction [Line Items]    
Due from Related Parties, Current $ 500 $ 0