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GEOGRAPHIC AND CUSTOMER CONCENTRATION INFORMATION - Property and Equipment by Geographic Area (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 29, 2013
Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net $ 6,369 $ 7,387
United States
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net 3,521 3,824
Germany
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net 2,733 3,131
Others
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net $ 115 $ 432