Business Segments and Major Customers (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Customer A [Member]
Revenue And Accounts Receivable By Major Customers By Reporting Segments [Line Items]
Accounts Receivable, Major Customer, Amount	$ 5,492	$ 1,423
Customer B [Member]
Revenue And Accounts Receivable By Major Customers By Reporting Segments [Line Items]
Accounts Receivable, Major Customer, Amount	1,945	2,236
Customer C [Member]
Revenue And Accounts Receivable By Major Customers By Reporting Segments [Line Items]
Accounts Receivable, Major Customer, Amount	690	994
Customer D [Member]
Revenue And Accounts Receivable By Major Customers By Reporting Segments [Line Items]
Accounts Receivable, Major Customer, Amount	935	1,691
North America [Member] | Customer A [Member]
Revenue And Accounts Receivable By Major Customers By Reporting Segments [Line Items]
Revenue, Major Customer, Amount	0	0
North America [Member] | Customer B [Member]
Revenue And Accounts Receivable By Major Customers By Reporting Segments [Line Items]
Revenue, Major Customer, Amount	2,831	3,359
North America [Member] | Customer C [Member]
Revenue And Accounts Receivable By Major Customers By Reporting Segments [Line Items]
Revenue, Major Customer, Amount	1,718	1,508
North America [Member] | Customer D [Member]
Revenue And Accounts Receivable By Major Customers By Reporting Segments [Line Items]
Revenue, Major Customer, Amount	1,250	1,833
EMEA [Member] | Customer A [Member]
Revenue And Accounts Receivable By Major Customers By Reporting Segments [Line Items]
Revenue, Major Customer, Amount	$ 5,705	$ 1,538