Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2019	Jan. 02, 2018	Jan. 03, 2017
Income Tax Disclosure [Abstract]
Federal income tax benefit at federal rate	$ (1,825)	$ (12,814)	$ (23,740)
State income tax benefit, net of federal tax	(623)	(1,790)	(2,975)
Other permanent differences	70	674	996
Foreign rate differential	0	463	214
Tax credits	(602)	(808)	(749)
Change in valuation allowance	2,600	(159)	27,353
Tax rate change	(248)	13,632	0
Deferred tax asset write-off	212	2,618	0
Other items, net	168	(1,097)	134
Total (benefit) provision for income taxes	$ (248)	$ (207)	$ 1,233
Effective income tax rate	2.90%	0.50%	(1.80%)