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Equity and Long-term Investments and Fair Value Measurements - Equity Investment in InCarda (Details) - InCarda $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 USD ($) | Dec. 31, 2025 USD ($) Director shares | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 USD ($)
Equity Investment |  |  |  |
Number of Investee's Board members currently representing the Company | Director |  | 0 |  |
Number of the Investee's Board members | Director |  | 6 |  |
Carrying value wrote off warrant exercise |  |  |  | $ 0.1
Unrealized loss from fair value changes in equity investments |  |  |  | $ 3.1
Innoviva TRC Holdings, LLC |  |  |  |
Equity Investment |  |  |  |
Maximum number of additional shares into which warrants may be converted under the securities purchase agreement | shares |  | 2,490,033 | 2,490,033 |
Consolidated Investees |  |  |  |
Equity Investment |  |  |  |
Equity investment ownership percentage |  | 9.50% | 9.10% |
InCarda October 2025 Convertible Note |  |  |  |
Equity Investment |  |  |  |
Amount of securities purchase agreement |  | $ 1.2 |  |
InCarda February 2025 Convertible Note |  |  |  |
Equity Investment |  |  |  |
Amount of securities purchase agreement |  | 0.5 |  |
InCarda 2024 Convertible Note |  |  |  |
Equity Investment |  |  |  |
Amount of securities purchase agreement |  | 0.4 |  |
InCarda Convertible Note |  |  |  |
Equity Investment |  |  |  |
Equity and long-term investments at fair value |  | $ 2.1 | $ 0.4 |
Common and Preferred Stock | Innoviva TRC Holdings, LLC |  |  |  |
Equity Investment |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares |  | 36,742,250 | 36,742,250 |
Series C preferred stock |  |  |  |
Equity Investment |  |  |  |
Equity and long-term investments at fair value |  | $ 4.8 | $ 4.8 |
Series D Warrants |  |  |  |
Equity Investment |  |  |  |
Equity and long-term investments at fair value |  | 0.1 | 0.1 |
Series D 1 And D 2 Preferred Stock And Common Stock |  |  |  |
Equity Investment |  |  |  |
Equity and long-term investments at fair value |  | $ 2.7 | $ 2.7 |
Backsolve Valuation |  |  |  |
Equity Investment |  |  |  |
Impairment of equity investments | $ 2.9 |  |  |
Significant Unobservable Inputs, Level 3 | Backsolve Valuation |  |  |  |
Equity Investment |  |  |  |
Expected holding period | 2 years |  |  |
Risk free interest rate | 4.90% |  |  |
Dividend yield | 0.00% |  |  |
Estimated volatility | 114.20% |  |  |

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