Net Income per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income (loss) attributable to Vicor Corporation		$ 10,593	$ 19,394	$ 15,592	$ 34,486
Denominator:
Denominator for basic net income per share-weighted average shares	[1]	43,973	43,553	43,963	43,504
Effect of dilutive securities:
Employee stock options	[2]	893	1,288	947	1,337
Denominator for diluted net income per share – adjusted weighted-average shares and assumed conversions		44,866	44,841	44,910	44,841
Basic net income (loss) per share		$ 0.24	$ 0.45	$ 0.35	$ 0.79
Diluted net income (loss) per share		$ 0.24	$ 0.43	$ 0.35	$ 0.77

[1] Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.

[2] Options to purchase 898,640 and 658,014 shares of Common Stock for the three and six months ended June 30, 2022, respectively, and options to purchase 138,125 and 90,339 shares of Common Stock for the three and six months ended June 30, 2021, respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.