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Earnings Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings (Loss) Per Share The following is a summary of Lexicon’s earnings (loss) per share calculations and reconciliations of basic to diluted earnings (loss) per share:
| Year Ended December 31,
(In thousands, except per share amounts) | 2020 |  | 2019 |  | 2018
Numerator: |  |  |  |  |
Net income (loss) | $ | (58,574) |  |  | $ | 130,133 |  |  | $ | (120,548) |
Add interest expense on Convertible Notes | — |  |  | 5,067 |  |  | — |
Adjusted net income (loss) | $ | (58,574) |  |  | $ | 135,200 |  |  | $ | (120,548) |
Denominator: |  |  |  |  |
Shares used in computing net income (loss) per common share, basic | 110,841 |  |  | 106,218 |  |  | 105,830 |
Add effect of potential dilutive securities |  |  |  |  |
Share based awards | — |  |  | 164 |  |  | — |
Convertible Notes | — |  |  | 10,365 |  |  | — |
Shares used in computing net income (loss) per common share, diluted | 110,841 |  |  | 116,747 |  |  | 105,830 |
Net income (loss) per share - basic | $ | (0.53) |  |  | $ | 1.23 |  |  | $ | (1.14) |
Net income (loss) per share - diluted | $ | (0.53) |  |  | $ | 1.16 |  |  | $ | (1.14) |
For periods presented with a net loss, the weighted average number of shares outstanding are the same for both basic and diluted net loss per common share. The average number of shares associated with stock options and restricted stock units that were excluded from diluted earnings per share that would potentially dilute earnings per share in the future was 11,113,054, 8,206,390 and 7,438,134, respectively, for the years ended December 31, 2020, 2019 and 2018. For periods presented with a net loss, the shares associated with the Convertible Notes are not included in the computation of diluted earnings per share because they are antidilutive.

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