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Revenue Recognition (Details) - Company`s receivables and contract liabilities with customers - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Revenue Recognition (Details) - Company`s receivables and contract liabilities with customers [Line Items]    
Gross receivables $ 3,196 $ 4,067
Allowance for bad debts 644 1,796
Net receivables 2,552 2,271
Contract liabilities $ 1,325 $ 465