Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 574	$ 813
Increases for current year tax positions	46	63
Increases for prior year tax positions		(302)
Balance at end of year	$ 620	$ 574