Geographic and Significant Customer Information (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011
Long-lived tangible assets:
Total long-lived tangible assets	$ 43,080	$ 35,521
United States [Member]
Long-lived tangible assets:
Long-lived tangible assets	40,361	33,127
Europe [Member]
Long-lived tangible assets:
Long-lived tangible assets, other countries	1,739	1,415
Japan [Member]
Long-lived tangible assets:
Long-lived tangible assets, other countries	177	159
South Korea [Member]
Long-lived tangible assets:
Long-lived tangible assets, other countries	538	503
Taiwan [Member]
Long-lived tangible assets:
Long-lived tangible assets, other countries	91	113
All other [Member]
Long-lived tangible assets:
Long-lived tangible assets, other countries	$ 174	$ 204