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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Numerator:        
Net income attributable to Vicor Corporation $ 191 $ 1,082 $ 737 $ 8,166
Denominator:        
Denominator for basic income per share-weighted average shares 41,811 41,810 41,811 41,793
Effect of dilutive securities:        
Employee stock options 4 41 7 72
Denominator for diluted income per share-adjusted weighted-average shares and assumed conversions 41,815 41,851 41,818 41,865
Computation of basic and diluted income per share        
Basic income per share $ 0.00 $ 0.03 $ 0.02 $ 0.20
Diluted income per share $ 0.00 $ 0.03 $ 0.02 $ 0.20