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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2013
Accounting Policies [Abstract] |
Computation of Basic and Diluted Income (Loss) Per Share | The following table sets forth the computation of basic and diluted income (loss) per share for the years ended December 31 (in thousands, except per share amounts):
|  | 2013 |  |  | 2012 |  |  | 2011 |
Numerator: |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Vicor Corporation |  | $ | (23,640 | ) |  | $ | (4,077 | ) |  | $ | 8,843 |
Denominator: |  |  |  |  |  |  |  |  |
Denominator for basic income (loss) per share-weighted average shares (1) |  |  | 39,195 |  |  |  | 41,811 |  |  |  | 41,797 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |
Employee stock options (2) |  |  | — |  |  |  | — |  |  |  | 59 |
Denominator for diluted income (loss) per share — adjusted weighted-average shares and assumed conversions (3) |  |  | 39,195 |  |  |  | 41,811 |  |  |  | 41,856 |
Basic income (loss) per share |  | $ | (0.60 | ) |  | $ | (0.10 | ) |  | $ | 0.21 |
Diluted income (loss) per share |  | $ | (0.60 | ) |  | $ | (0.10 | ) |  | $ | 0.21 |
(1) | Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding.
(2) | Options to purchase 1,989,248, 545,345, and 305,268 shares of Common Stock in 2013, 2012, and 2011, respectively, were not included in the calculation of net income (loss) per share as the effect would have been antidilutive.
(3) | Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding for the year, adjusted to include the dilutive effect, if any, of outstanding options.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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