Income Taxes - Schedule of Components of the Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 0	$ 0	$ 0
State	18	74	25
Total current provision	18	74	25
Deferred:
Federal	410	547	547
State	40	34	34
Tax Act impact	(2,632)	0	0
Total deferred (benefit) provision	(2,182)	581	581
Total income tax (benefit) provision	$ (2,164)	$ 655	$ 606