Other Current Assets - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid vendor payments	$ 5,048	$ 3,633
Income tax receivable	4,237	3,614
Prepaid software maintenance	3,386	2,804
Prepaid insurance	2,610	2,479
Prepaid taxes	912	850
Prepaid rent	730	327
Prepaid other	2,172	731
Other	1,935	4,011
Other current assets	$ 21,030	$ 18,449