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Significant Accounting Policies - Computation of Basic and Diluted Income (Loss) Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator:                      
Net income (loss) attributable to Vicor Corporation $ (13,102) $ (932) $ (4,616) $ (4,990) $ (4,814) $ 191 $ 220 $ 326 $ (23,640) $ (4,077) $ 8,843
Denominator:                      
Denominator for basic income (loss) per share-weighted average shares                 39,195 41,811 41,797
Effect of dilutive securities:                      
Employee stock options                       59
Denominator for diluted income (loss) per share - adjusted weighted-average shares and assumed conversions                 39,195 41,811 41,856
Basic income (loss) per share                 $ (0.60) $ (0.10) $ 0.21
Diluted income (loss) per share                 $ (0.60) $ (0.10) $ 0.21