Segment, Geographic, Product and Significant Customer Information - Long-lived Tangible Assets (Details) - USD ($) $ in Thousands	Jun. 25, 2016	Dec. 26, 2015
Long-lived tangible assets:
Total long-lived tangible assets	$ 43,484	$ 44,493
United States [Member]
Long-lived tangible assets:
Total long-lived tangible assets	41,809	42,581
Japan [Member]
Long-lived tangible assets:
Total long-lived tangible assets	60	59
South Korea [Member]
Long-lived tangible assets:
Total long-lived tangible assets	623	697
All other [Member]
Long-lived tangible assets:
Total long-lived tangible assets	$ 992	$ 1,156