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Net Income (Loss) per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Income Per Share | The following table sets forth the computation of basic and diluted income (loss) per share for the three and six months ended June 30 (in thousands, except per share amounts):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Vicor Corporation |  | $ | (4,616 | ) |  | $ | 220 |  |  | $ | (9,606 | ) |  | $ | 546 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic income (loss) per share-weighted average shares (1) |  |  | 38,538 |  |  |  | 41,811 |  |  |  | 39,852 |  |  |  | 41,811 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options (2) |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | 8 |
Denominator for diluted income (loss) per share – adjusted weighted-average shares and assumed conversions |  |  | 38,538 |  |  |  | 41,812 |  |  |  | 39,852 |  |  |  | 41,819 |
Basic income (loss) per share |  | $ | (0.12 | ) |  | $ | 0.01 |  |  | $ | (0.24 | ) |  | $ | 0.01 |
Diluted income (loss) per share |  | $ | (0.12 | ) |  | $ | 0.01 |  |  | $ | (0.24 | ) |  | $ | 0.01 |
(1) | Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding.
(2) | Options to purchase 861,958 and 733,120 shares of Common Stock for the three and six months ended June 30, 2013, respectively, were not included in the calculation of net loss per share as the effect would have been antidilutive. Options to purchase 536,173 and 1,682,021 shares of Common Stock for the three and six months ended June 30, 2012, respectively, were not included in the computation of diluted income per share because the options’ exercise prices were greater than the average market price of the Common Stock and, therefore, the effect would be antidilutive.

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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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