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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Current assets:    
Accounts receivable, less allowance $ 266 $ 309
Vicor Corporation stockholders' equity:    
Preferred Stock, par value $ 0.01 $ 0.01
Preferred Stock, shares authorized 1,000,000 1,000,000
Preferred Stock, shares issued      
Common Stock, votes per share $ 1 $ 1
Common Stock, par value $ 0.01 $ 0.01
Common Stock, shares authorized 62,000,000 62,000,000
Common Stock, shares issued 38,441,595 38,400,897
Common Stock, shares outstanding 30,043,197 30,002,499
Treasury stock, shares 8,398,398 8,398,398
Class B Common Stock
    
Vicor Corporation stockholders' equity:    
Common Stock, votes per share $ 10 $ 10
Common Stock, par value $ 0.01 $ 0.01
Common Stock, shares authorized 14,000,000 14,000,000
Common Stock, shares issued 11,767,052 11,767,052
Common Stock, shares outstanding 11,767,052 11,767,052