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Financial Instruments and Fair Value Measurements - Equity Investment in Armata (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 27, 2020 USD ($) shares | Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) item tranche $ / shares | Sep. 30, 2019 USD ($)
Equity Investment |  |  |  |  |
Changes in fair values of equity investments |  | $ (29,368) | $ 0 | $ 39,245 | $ 0
Armata |  |  |  |  |
Equity Investment |  |  |  |  |
Number of tranches | tranche |  |  |  | 2 |
Number of Innoviva board members who joined investee's board | item |  |  |  | 2 |
Equity investment ownership percentage |  | 46.70% |  | 46.70% |
Changes in fair values of equity investments |  | $ (12,400) |  | $ 23,000 |
Common stock and warrants | Armata |  |  |  |  |
Equity Investment |  |  |  |  |
Amount of securities purchase agreement | $ 25,000 |  |  |  |
Equity investments at fair value |  | 48,000 |  | 48,000 |
Common stock | Armata |  |  |  |  |
Equity Investment |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares | 8,710,800 |  |  |  |
Equity investments at fair value |  | $ 27,800 |  | $ 27,800 |
Warrants | Armata |  |  |  |  |
Equity Investment |  |  |  |  |
Maximum number of additional shares into which warrants may be converted under the securities purchase agreement | shares | 8,710,800 |  |  |  |
Exercise price of warrants | $ / shares |  | $ 2.87 |  | $ 2.87 |
Term of warrants |  | 5 years |  | 5 years |
Equity investments at fair value |  | $ 20,200 |  | $ 20,200 |

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