Income Taxes (Domestic and foreign components of (loss) income before income taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Jan. 02, 2018
Income Tax Examination [Line Items]
Income (loss) before income taxes	$ 1,751	$ (8,689)	$ (37,689)
Domestic
Income Tax Examination [Line Items]
Income (loss) before income taxes	1,751	(8,689)	(42,047)
Foreign
Income Tax Examination [Line Items]
Income (loss) before income taxes	$ 0	$ 0	$ 4,358