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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory federal tax rate	(34.00%)	(34.00%)	(34.00%)
State income taxes, net of federal income tax benefit	97.20%	1.90%	46.40%
Rate change due to tax reform	3441.10%
Tax credits	(1222.30%)	(13.60%)	29.90%
Increase (decrease) in valuation allowance	(936.10%)	46.50%	(138.40%)
Permanent items	(861.20%)	0.90%	21.20%
Refundable income taxes - AMT credit	(751.00%)
Foreign rate differential and deferred items	(91.80%)	(0.80%)	(18.20%)
Decrease in tax reserves	(5.10%)		(248.60%)
Capital gain on sale to noncontrolling interest		3.90%	237.80%
Decrease in unremitted Vicor Custom Power earnings		(0.90%)	(108.70%)
Book income attributable to noncontrolling interest		0.10%	47.00%
Other	(0.10%)	(0.20%)	(0.10%)
Effective income tax rate	(363.30%)	3.80%	(165.70%)

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 noncontrolling interest income (loss) exempt from income taxes.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Effective income tax rate reconciliation decrease in unremitted earnings.

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Effective income tax rate reconciliation tax credits adjustments.

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