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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Computation of Basic and Diluted Loss Per Share | The following table sets forth the computation of basic and diluted loss per share for the years ended December 31 (in thousands, except per share amounts):
|  | 2014 |  |  | 2013 |  |  | 2012 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to Vicor Corporation |  | $ | (13,887 | ) |  | $ | (23,640 | ) |  | $ | (4,077 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic loss per share-weighted average shares (1) |  |  | 38,569 |  |  |  | 39,195 |  |  |  | 41,811 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options (2) |  |  | — |  |  |  | — |  |  |  | — |
Denominator for diluted loss per share — adjusted weighted-average shares and assumed conversions (3) |  |  | 38,569 |  |  |  | 39,195 |  |  |  | 41,811 |
Basic loss per share |  | $ | (0.36 | ) |  | $ | (0.60 | ) |  | $ | (0.10 | )
Diluted loss per share |  | $ | (0.36 | ) |  | $ | (0.60 | ) |  | $ | (0.10 | )
(1) | Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding.
(2) | Options to purchase 1,895,675, 1,989,248, and 545,345 shares of Common Stock in 2014, 2013, and 2012, respectively, were not included in the calculation of net 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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