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Significant Accounting Policies - Computation Of Basic And Diluted Net Income (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:                      
Net income attributable to Vicor Corporation $ 11,193 $ 5,785 $ 2,667 $ (1,735) $ 1,312 $ 5,937 $ 2,563 $ 4,286 $ 17,910 $ 14,098 $ 31,725
Denominator:                      
Denominator for basic net income per share- weighted average shares                 42,186 40,330 39,872
Effect of dilutive securities:                      
Employee stock options                 1,683 1,347 857
Denominator for diluted net income per share- adjusted weighted-average shares and assumed conversions                 43,869 41,677 40,729
Basic net income (loss) per share $ 0.26 $ 0.13 $ 0.06 $ (0.04) $ 0.03 $ 0.15 $ 0.06 $ 0.11 $ 0.42 $ 0.35 $ 0.80
Diluted net income (loss) per share $ 0.25 $ 0.13 $ 0.06 $ (0.04) $ 0.03 $ 0.14 $ 0.06 $ 0.10 $ 0.41 $ 0.34 $ 0.78