Summary of Significant Accounting Policies - Schedule of other income (expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Other (expense) income [Abstract]
Foreign currency loss	$ 39	$ (24)
Rental (loss) income-net	(683)	(662)
Insurance recovery / investment write off	0	771
Fair value adjustment contingent consideration	1,000	1,130
Other	273	101
Other income	$ 629	$ 1,316