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Net Income (Loss) per Share - Computation of Basic and Diluted Income Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Net income (loss) attributable to Vicor Corporation $ (932) $ 191 $ (10,538) $ 737
Denominator:        
Denominator for basic income (loss) per share-weighted average shares 38,538 41,811 39,414 41,811
Effect of dilutive securities:        
Employee stock options    4    7
Denominator for diluted income (loss) per share - adjusted weighted-average shares and assumed conversions 38,538 41,815 39,414 41,818
Basic income (loss) per share $ (0.02)    $ (0.27) $ 0.02
Diluted income (loss) per share $ (0.02)    $ (0.27) $ 0.02