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Summary of Significant Accounting Policies - Schedule of other income, net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Other (expense) income [Abstract] |  |
Foreign currency (loss) / gain | $ (258) | $ 39
Rental loss-net | (865) | (683)
Gain on sale of real estate | 649 | 0
Fair value adjustment contingent consideration | 450 | 1,000
Other | 330 | 273
Other income, net | $ 306 | $ 629

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