Summary of Significant Accounting Policies (Schedule of Differences between Total Income Tax or Benefit and Amount Computed by Applying the Statutory Income Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of Significant Accounting Policies [Abstract]
Statutory rate of applied to pre-tax income (loss)	$ (9,656)	$ (5,109)	$ (7,299)
Permanent differences, net	(97)	284	2,021
State income tax, net of federal benefit	(1,430)	(388)	(689)
Foreign income tax	78	44	33
Federal and State rate change	(146)	(3,251)
Contribution of assets to TRS		(866)
Other	41	(244)
Valuation allowance increase (decrease)	7,648	320
Total tax expense (benefit)	$ (3,368)	$ (9,778)	$ (9,976)
Effective tax rate	7.30%	65.10%	46.50%
Statutory rate	21.00%