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NET INCOME (LOSS) PER SHARE - Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 07, 2017
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Innoviva stockholders, basic | $ 58,385 | $ 23,767 | $ 35,146 | $ 16,845 |  |  |  |  | $ 134,143 | $ 59,536 | $ (18,760) |
Add: interest expense on 2023 Notes |  |  |  |  |  |  |  |  | 5,647 | 5,790 | 0 |
Net income (loss) attributable to Innoviva stockholders, diluted |  |  |  |  |  |  |  |  | $ 139,790 | $ 65,326 | $ (18,760) |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares used to compute basic net income (loss) per share attributable to Innoviva stockholders |  |  |  |  |  |  |  |  | 106,945,000 | 110,280,000 | 115,372,000 |
Dilutive effect of 2023 Notes |  |  |  |  |  |  |  |  | 12,189,000 | 12,541,000 | 0 |
Dilutive effect of options and awards granted under equity incentive plan and employee stock purchase plan |  |  |  |  |  |  |  |  | 732,000 | 412,000 | 0 |
Weighted-average shares used to compute diluted net income (loss) per share attributable to Innoviva stockholders |  |  |  |  |  |  |  |  | 119,866,000 | 123,233,000 | 115,372,000 |
Net income (loss) per share attributable to Innoviva stockholders |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share | $ 0.55 | $ 0.22 | $ 0.33 | $ 0.16 | $ 0.24 | $ 0.14 | $ 0.13 | $ 0.04 | $ 1.25 | $ 0.54 | $ (0.16) |
Diluted net income per share | 0.50 | $ 0.21 | $ 0.30 | $ 0.15 | $ 0.22 | $ 0.13 | $ 0.13 | $ 0.04 | $ 1.17 | $ 0.53 | $ (0.16) |
Convertible senior notes | 2025 Notes |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per share |  |  |  |  |  |  |  |  |  |  |  |
Dilutive effect of 2025 Notes |  |  |  |  |  |  |  |  | 0 |  |  |
Convertible senior notes | 2025 Notes | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per share |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of convertible notes into common stock (in dollars per share) | $ 17.26 |  |  |  |  |  |  |  | $ 17.26 |  |  | $ 17.26

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