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Net Income per Share | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Net Income per Share | 11. 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 June 30, |  |  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Vicor Corporation |  | $ | 2,563 |  |  | $ | 7,860 |  |  | $ | 6,849 |  |  | $ | 11,803 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic net income per share-weighted average shares (1) |  |  | 40,275 |  |  |  | 39,709 |  |  |  | 40,252 |  |  |  | 39,594 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options (2) |  |  | 806 |  |  |  | 937 |  |  |  | 803 |  |  |  | 812 |
Denominator for diluted net income per share – adjusted weighted-average shares and assumed conversions |  |  | 41,081 |  |  |  | 40,646 |  |  |  | 41,055 |  |  |  | 40,406 |
Basic net income per share |  | $ | 0.06 |  |  | $ | 0.20 |  |  | $ | 0.17 |  |  | $ | 0.30 |
Diluted net income per share |  | $ | 0.06 |  |  | $ | 0.19 |  |  | $ | 0.17 |  |  | $ | 0.29 |
(1) | Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.
(2) | Options to purchase 142,817 and 128,018 shares of Common Stock for the three and six months ended June 30, 2019, respectively, and 44,793 and 79,857 shares of Common Stock for the three and six months ended June 30, 2018, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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