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Revenue Recognition (Details) - Company`s receivables and contract liabilities with customers - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Revenue Recognition (Details) - Company`s receivables and contract liabilities with customers [Line Items]    
Gross receivables $ 2,780 $ 3,124
Allowance for bad debts 860 743
Net receivables 1,920 2,381
Contract liabilities $ 869 $ 230