Income Taxes - Income (Loss) Before Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Domestic	$ 2,468	$ (1,527)	$ (144)
Foreign	3,359	14,153	12,950
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT)	$ 5,827	$ 12,626	$ 12,806