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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Net income (loss) attributable to Vicor Corporation $ (4,616) $ 220 $ (9,606) $ 546
Denominator:        
Denominator for basic income (loss) per share-weighted average shares 38,538 41,811 39,852 41,811
Effect of dilutive securities:        
Employee stock options   1   8
Denominator for diluted income (loss) per share - adjusted weighted-average shares and assumed conversions 38,538 41,812 39,852 41,819
Basic income (loss) per share $ (0.12) $ 0.01 $ (0.24) $ 0.01
Diluted income (loss) per share $ (0.12) $ 0.01 $ (0.24) $ 0.01