Business Segments (Details 1)	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2017		Oct. 01, 2016		Sep. 30, 2017		Oct. 01, 2016		Dec. 31, 2016
Customer G [Member] | Sales Revenue, Net [Member]
Customer concentration risk	37.80%			[1]	16.80%			[1]
Customer G [Member] | Trade Receivables [Member]
Customer concentration risk					30.30%					[1]
Customer D [Member] | Sales Revenue, Net [Member]
Customer concentration risk	12.10%		12.30%			[1]		[1]
Customer D [Member] | Trade Receivables [Member]
Customer concentration risk						[1]			10.20%
Customer C [Member] | Sales Revenue, Net [Member]
Customer concentration risk		[1]		[1]		[1]	24.50%
Customer C [Member] | Trade Receivables [Member]
Customer concentration risk					45.40%				45.80%

[1] Represents less than 10%.