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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
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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%

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