Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 0
Goodwill recorded in connection with the HCS Acquisition	12,705	$ 0
Impairment charge	(4,500)	0
Goodwill, ending balance	$ 8,205	$ 0