Discontinued Operations - Reconciliation of Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Major classes of line items constituting net loss on discontinued operations:
Net loss	$ (3,626)	$ (2,786)	$ (15,245)	$ (14,688)
Nutri-Force | Held for sale
Major classes of line items constituting net loss on discontinued operations:
Net sales	761	5,779	11,187	25,325
Cost of goods sold	2,417	6,273	9,756	34,873
Fixed assets impairment charges	0	0	7,236	1,820
Gross loss	(1,656)	(494)	(5,805)	(11,368)
Selling, general and administrative expenses	629	4,036	2,581	12,275
Intangible assets and fixed assets impairment charges	0	0	8,978	0
Discontinued operations loss	40	0	203	0
Loss before provision (benefit) for income taxes	(2,325)	(4,530)	(17,567)	(23,643)
Provision (benefit) for income taxes	1,301	(1,744)	(2,322)	(8,955)
Net loss	(3,626)	$ (2,786)	(15,245)	$ (14,688)
Nutri-Force | Held for sale | Transition Service Agreement
Major classes of line items constituting net loss on discontinued operations:
Net sales	$ 800		$ 2,400