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Revenue Recognition (Details) - Company`s receivables and contract liabilities with customers - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Revenue Recognition (Details) - Company`s receivables and contract liabilities with customers [Line Items]    
Gross receivables $ 4,067 $ 3,757
Allowance for bad debts 1,796 235
Net receivables 2,271 3,522
Contract liabilities $ 465 $ 1,209