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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Net income (loss) attributable to Vicor Corporation $ 805 $ (4,835) $ 4,176 $ (10,213)
Denominator:        
Denominator for basic net income (loss) per share-weighted average shares 38,750 38,542 38,719 38,541
Effect of dilutive securities:        
Employee stock options 543   502  
Denominator for diluted net income (loss) per share - adjusted weighted-average shares and assumed conversions 39,293 38,542 39,221 38,541
Basic net income (loss) per share $ 0.02 $ (0.13) $ 0.11 $ (0.26)
Diluted net income (loss) per share $ 0.02 $ (0.13) $ 0.11 $ (0.26)