Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax (Provision) Benefit at Federal Rate Related to Continuing Operations	$ (1,416)	$ (1,764)	$ 64
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	(609)	0	0
State Tax Provision, Net of Federal Benefit	(376)	(462)	(212)
Non-deductible Permanent Items, Net	0	7	10
Change in Valuation Allowance	1,197	1,256	787
Other	11	(126)	(766)
Income Tax Provision	$ (1,193)	$ (1,089)	$ (117)