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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 |

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