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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Numerator:        
Net income attributable to Vicor Corporation $ 220 $ 3,066 $ 546 $ 7,084
Denominator:        
Denominator for basic income per share-weighted average shares 41,811 41,798 41,811 41,785
Effect of dilutive securities:        
Employee stock options 1 89 8 88
Denominator for diluted income per share-adjusted weighted-average shares and assumed conversions 41,812 41,887 41,819 41,873
Computation of basic and diluted income per share        
Basic income per share $ 0.01 $ 0.07 $ 0.01 $ 0.17
Diluted income per share $ 0.01 $ 0.07 $ 0.01 $ 0.17