Prepaid Expenses and Other Assets - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Number of years of participation (in years)	10 years
Refund reduction percent	20.00%
Refund percent		20.00%
Prepaid taxes	$ 814	$ 1,300