Significant Accounting Policies - Computation Of Basic And Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income attributable to Vicor Corporation		$ 56,625	$ 17,910	$ 14,098
Denominator:
Denominator for basic net income per share- weighted average shares	[1]	43,651	42,186	40,330
Effect of dilutive securities:
Employee stock options	[2]	1,315	1,683	1,347
Denominator for diluted net income per share- adjusted weighted-average shares and assumed conversions	[3]	44,966	43,869	41,677
Basic net income per share		$ 1.30	$ 0.42	$ 0.35
Diluted net income per share		$ 1.26	$ 0.41	$ 0.34

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

[2] Options to purchase 60,736, 181,196 and 164,367 shares of Common Stock in 2021, 2020, and 2019, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive.

[3] Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding for the year, adjusted to include the dilutive effect, if any, of outstanding options.