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Net Income (Loss) per Share - Computation of Basic and Diluted Net Income (Loss) per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator:        
Net income (loss) attributable to Vicor Corporation $ 2,503 $ (3,674) $ 6,679 $ (13,887)
Denominator:        
Denominator for basic net income (loss) per share-weighted average shares 38,786 38,552 38,742 38,545
Effect of dilutive securities:        
Employee stock options 300   434  
Denominator for diluted net income (loss) per share - adjusted weighted-average shares and assumed conversions 39,086 38,552 39,176 38,545
Basic net income (loss) per share $ 0.06 $ (0.10) $ 0.17 $ (0.36)
Diluted net income (loss) per share $ 0.06 $ (0.10) $ 0.17 $ (0.36)