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Quarterly Results of Operations (Unaudited) - Summary of Unaudited Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Net revenues $ 84,302 $ 78,112 $ 70,761 $ 63,401 $ 63,125 $ 70,772 $ 63,355 $ 65,725 $ 296,576 $ 262,977 $ 291,220
Gross margin 40,451 33,347 30,318 27,331 29,761 33,002 29,117 31,086 131,447 122,966 138,971
Consolidated net income 11,195 5,786 2,672 (1,731) 1,315 5,932 2,556 4,306 17,922 14,109 31,846
Net income (loss) attributable to noncontrolling interest 2 1 5 4 3 (5) (7) 20 12 11 121
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
Net income per share attributable to Vicor Corporation:                      
Basic $ 0.26 $ 0.13 $ 0.06 $ (0.04) $ 0.03 $ 0.15 $ 0.06 $ 0.11 $ 0.42 $ 0.35 $ 0.80
Diluted $ 0.25 $ 0.13 $ 0.06 $ (0.04) $ 0.03 $ 0.14 $ 0.06 $ 0.10 $ 0.41 $ 0.34 $ 0.78