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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Statutory federal tax rate | (34.00%) | (34.00%) | (34.00%)
State income taxes, net of federal income tax benefit | 1.90% | 46.40% | 0.80%
(Decrease) increase in valuation allowance | 46.50% | (138.40%) | 46.90%
Tax credits | (13.60%) | 29.90% | (12.40%)
Capital gain on sale to noncontrolling interest | 3.90% | 237.80% |
Permanent items | 0.90% | 21.20% | 0.40%
Decrease in unremitted Vicor Custom Power earnings | (0.90%) | (108.70%) |
Foreign rate differential and deferred items | (0.80%) | (18.20%) | (0.30%)
Book income attributable to noncontrolling interest | 0.10% | 47.00% | (0.60%)
Decrease in tax reserves |  | (248.60%) | (3.70%)
Other | (0.20%) | (0.10%) |
Effective income tax rate | 3.80% | (165.70%) | (2.90%)

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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