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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, 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%)

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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=84230637&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=84230637&loc=d3e32698-109319 + Details
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