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Net Income Per Share - Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Numerator: |  |  |  |
Net income attributable to Innoviva stockholders, basic | $ 37,740 | $ 54,626 | $ 71,530 | $ 84,207
Add: interest expense on 2023 Notes | 1,158 | 1,417 | 2,325 | 2,829
Net income attributable to Innoviva stockholders, diluted | $ 38,898 | $ 56,043 | $ 73,855 | $ 87,036
Denominator: |  |  |  |
Weighted-average shares used to compute basic net income per share attributable to Innoviva stockholders | 101,151 | 100,873 | 101,105 | 100,739
Dilutive effect of 2023 Notes | 12,189 | 12,189 | 12,189 | 12,189
Dilutive effect of options and awards granted under equity incentive plan and employee stock purchase plan | 51 | 337 | 90 | 555
Weighted-average shares used to compute diluted net income per share attributable to Innoviva stockholders | 113,391 | 113,399 | 113,384 | 113,483
Net income per share attributable to Innoviva stockholders |  |  |  |
Basic net income per share | $ 0.37 | $ 0.54 | $ 0.71 | $ 0.84
Diluted net income per share | $ 0.34 | $ 0.49 | $ 0.65 | $ 0.77
Convertible senior notes | 2025 Notes |  |  |  |
Net Income Per Share |  |  |  |
Dilutive effect of the assumed conversion premium | 0 | 0 | 0 | 0
Convertible senior notes | 2025 Notes | Common Stock |  |  |  |
Net Income Per Share |  |  |  |
Conversion price of convertible notes into common stock (in dollars per share) | $ 17.26 |  | $ 17.26 |

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