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Net Income per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Net Income Per Share | The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Vicor Corporation |  | $ | 13,259 |  |  | $ | 5,785 |  |  | $ | 47,745 |  |  | $ | 6,717 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic net income per share-weighted average shares (1) |  |  | 43,710 |  |  |  | 43,164 |  |  |  | 43,573 |  |  |  | 41,814 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options (2) |  |  | 1,324 |  |  |  | 1,579 |  |  |  | 1,332 |  |  |  | 1,753 |
Denominator for diluted net income per share – adjusted weighted-average shares and assumed conversions |  |  | 45,034 |  |  |  | 44,743 |  |  |  | 44,905 |  |  |  | 43,567 |
Basic net income per share |  | $ | 0.30 |  |  | $ | 0.13 |  |  | $ | 1.10 |  |  | $ | 0.16 |
Diluted net income per share |  | $ | 0.29 |  |  | $ | 0.13 |  |  | $ | 1.06 |  |  | $ | 0.15 |
(1) | Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.
(2) | Options to purchase 76,114 and 134,822 shares of Common Stock for the three and nine months ended September 30, 2021, respectively, and options to purchase 265,725 and 130,027 shares of Common Stock for the three and nine months ended September 30, 2020, respectively, were not included in the calculations of net income per share as the effect would have been 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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