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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net income attributable to Vicor Corporation	$ 1,312	$ 5,937	$ 2,563	$ 4,286	$ 6,910	$ 13,012	$ 7,860	$ 3,943	$ 14,098	$ 31,725	$ 167
Denominator:
Denominator for basic net income per share- weighted average shares									40,330	39,872	39,228
Effect of dilutive securities:
Employee stock options									1,347	857	705
Denominator for diluted net income per share- adjusted weighted-average shares and assumed conversions									41,677	40,729	39,933
Basic net income (loss) per share	$ 0.03	$ 0.15	$ 0.06	$ 0.11	$ 0.17	$ 0.32	$ 0.20	$ 0.10	$ 0.35	$ 0.80	$ 0.00
Diluted net income (loss) per share	$ 0.03	$ 0.14	$ 0.06	$ 0.10	$ 0.17	$ 0.32	$ 0.19	$ 0.10	$ 0.34	$ 0.78	$ 0.00

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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