Geographic and Significant Customer Information (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	$ 47,244	$ 47,439
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	44,963	44,775
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	105	125
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	383	445
All Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	$ 1,793	$ 2,094