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Financial Instruments and Fair Value Measurements - Equity Investment in Armata (Details) - Armata $ / shares in Units, $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 09, 2022 USD ($) $ / shares shares | Mar. 31, 2022 USD ($) Tranche Director $ / shares | Dec. 31, 2021 USD ($) $ / shares shares | Mar. 31, 2021 USD ($) shares | Mar. 31, 2020 USD ($) shares | Dec. 31, 2020 $ / shares
Equity investment |  |  |  |  |  |
Number of tranches | Tranche |  | 2 |  |  |  |
Equity investment ownership percentage |  | 69.40% | 59.30% |  |  |
Percentage of maximum voting rights | 49.50% | 49.50% |  |  |  |
Number of Investee's Board members currently representing the Company | Director |  | 3 |  |  |  |
Number of the Investee's Board members | Director |  | 8 |  |  |  |
Unrealized gain from fair value changes in equity investments |  |  |  | $ 61.2 |  |
Unrealized loss from fair value changes in equity investments |  | $ 4.2 |  |  |  |
Director |  |  |  |  |  |
Equity investment |  |  |  |  |  |
Armata outstanding shares percentage | 12.50% |  |  |  |  |
Common stock and warrants |  |  |  |  |  |
Equity investment |  |  |  |  |  |
Amount of securities purchase agreement |  |  |  |  | $ 25.0 |
Equity and long-term investments at fair value |  | $ 187.5 | $ 146.7 |  |  |
Warrants purchased in 2020 |  |  |  |  |  |
Equity investment |  |  |  |  |  |
Exercise price of warrants | $ / shares |  |  |  |  |  | $ 2.87
Warrants purchased in 2021 |  |  |  |  |  |
Equity investment |  |  |  |  |  |
Exercise price of warrants | $ / shares |  |  | $ 3.25 |  |  |
Warrants purchased in 2022 Member |  |  |  |  |  |
Equity investment |  |  |  |  |  |
Exercise price of warrants | $ / shares |  | $ 5.00 |  |  |  |
Warrants |  |  |  |  |  |
Equity investment |  |  |  |  |  |
Number of warrants purchased under the securities purchase agreement | shares |  |  |  |  | 8,710,800 |
Term of warrants |  | 5 years |  |  |  |
Equity and long-term investments at fair value |  | $ 64.9 | $ 58.6 |  |  |
Common stock |  |  |  |  |  |
Equity investment |  |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares |  |  |  |  | 8,710,800 |
Number of shares to be purchased under the securities purchase agreement | shares |  |  | 1,212,122 |  |  |
Amount of securities purchase agreement |  |  | $ 4.0 |  |  |
Equity and long-term investments at fair value |  | $ 122.6 | $ 88.1 |  |  |
Minimum [Member] |  |  |  |  |  |
Equity investment |  |  |  |  |  |
Armata outstanding shares percentage | 8.00% |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Equity investment |  |  |  |  |  |
Armata outstanding shares percentage | 12.50% |  |  |  |  |
Innoviva Strategic Opportunities, LLC | Common stock and warrants |  |  |  |  |  |
Equity investment |  |  |  |  |  |
Amount of securities purchase agreement | $ 45.0 |  |  | $ 20.0 |  |
Innoviva Strategic Opportunities, LLC | Warrants |  |  |  |  |  |
Equity investment |  |  |  |  |  |
Number of warrants to be purchased under the securities purchase agreement | shares | 4,500,000 |  |  | 6,153,847 |  |
Exercise price of warrants | $ / shares | $ 5.00 |  |  |  |  |
Innoviva Strategic Opportunities, LLC | Common stock |  |  |  |  |  |
Equity investment |  |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares | 9,000,000 |  |  | 6,153,847 |  |

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