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Income Taxes - Schedule of Reconciliation of Federal Statutory Rate on Loss before Income Taxes and before Gain from Sale of Equity Method Investment Rate to Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory federal tax rate	(34.00%)	(34.00%)	(34.00%)
State income taxes, net of federal income tax benefit	46.40%	0.80%	1.10%
Tax credits	29.90%	(12.40%)	(8.10%)
Book income attributable to noncontrolling interest	47.00%	(0.60%)	0.40%
Permanent items	21.20%	0.40%	0.60%
Decrease in tax reserves	(248.60%)	(3.70%)	(0.10%)
Foreign rate differential and deferred items	(18.20%)	(0.30%)	(0.20%)
Capital gain on sale to noncontrolling interest	237.80%
Decrease in unremitted Vicor Custom Power earnings	(108.70%)
(Decrease) increase in valuation allowance	(138.40%)	46.90%	53.30%
U.S. manufacturing deduction			1.70%
Other	(0.10%)		0.10%
Effective income tax rate	(165.70%)	(2.90%)	14.80%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Effective income tax rate reconciliation decrease in unremitted earnings.

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Effective income tax rate reconciliation permanent items.

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