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Prepaid Expenses and Other Assets (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 29, 2012
Sep. 29, 2012
Dec. 31, 2011
Prepaid Expenses and Other Assets      
Loans and advances to employees and non-employee experts $ 12,779,000 $ 12,779,000 $ 3,218,000
Prepaid rent and deposits 2,508,000 2,508,000 1,191,000
Prepaid insurance 2,309,000 2,309,000 1,515,000
Subscriptions and licenses 1,481,000 1,481,000 1,170,000
Other 1,455,000 1,455,000 1,130,000
Total 20,532,000 20,532,000 8,224,000
Term of forgivable loans or advances to employees and non-employee experts, minimum   3 years  
Term of forgivable loans or advances to employees and non-employee experts, maximum   5 years  
Forgivable loans issued to employees and non-employee experts for future service $ 9,800,000