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Related-party Transactions (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Current receivables due from related parties $ 2,780 $ 3,250 $ 7,150
VST [Member]      
Current receivables due from related parties 2,780 2,750 7,150
Emza [Member]      
Current receivables due from related parties $ 0 $ 500 $ 0