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Revenue Recognition and Trade Receivables, net, Accounts Receivables, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts Receivable, Net [Abstract]      
Trade receivables $ 7,506 $ 6,156  
Other receivables 19 78  
Less: allowance for bad debts (75) (55) $ (108)
Trade receivables, net $ 7,450 $ 6,179