Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 2	$ 23	$ 25	$ 80
Income Taxes (Textual) [Abstract]
Unrecognized tax benefits	9,300		9,300		$ 9,200
Unrecognized tax benefits that would impact effective tax rate	349		349		364
Accrued for interest and penalties	$ 56		56		$ 62
Reduction in gross unrecognized tax benefits			$ 6