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
	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statutory rate of 34% applied to pre-tax loss		$ (5,109)	$ (7,299)	$ (6,683)
Permanent differences, net		(284)	(2,021)	281
State income tax, net of federal benefit		(388)	(689)	(268)
Foreign income tax		44	33
Federal rate change		(3,251)
Contribution of Assets to TRS		(866)
Other		(244)
Valuation allowance (decrease) increase		320		(3,395)
Total tax benefit		$ (9,778)	$ (9,976)	$ (10,065)
Effective tax rate		65.10%	46.50%	34.80%
Statutory rate	21.00%	34.00%
Maximum
Statutory rate		35.00%