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Equity and Long-term Investments and Fair Value Measurements - Equity Investment in Armata (Details) - Armata $ / shares in Units, $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Jan. 10, 2023 USD ($) $ / shares | Feb. 09, 2022 USD ($) $ / shares shares | Mar. 31, 2023 USD ($) Tranche Director | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) shares | Mar. 31, 2021 USD ($) shares | Mar. 31, 2020 USD ($) shares | Dec. 31, 2022 USD ($)
Equity investment |  |  |  |  |  |  |  |
Number of tranches | Tranche |  |  | 2 |  |  |  |  |
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 |  |  |  |  |
Special terms on re-designating board member to board of investee |  | In addition, as of February 9, 2022, Armata entered into an amended and restated investor rights agreement with the Company and ISO, pursuant to which for as long as the Company and ISO hold at least 12.5% of the outstanding shares of Armata’s common stock on a fully-diluted, the Company and ISO shall have the right to designate two directors to Armata’s board of directors, and for so long as the Company and ISO hold at least 8%, but less than 12.5%, of the outstanding shares of Armata’s common stock on a fully-diluted basis, the Company and ISO shall have the right to designate one director to Armata’s board of directors, subject to certain conditions and qualifications set forth in the amended and restated investor rights agreement. |  |  |  |  |  |
Consolidated Investees |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  | 69.40% |  |  |  |  | 69.40%
Two Directors |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |
Armata outstanding shares percentage |  | 12.50% |  |  |  |  |  |
Secured Convertible Credit Agreement |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |
Debt instrument, description | On January 10, 2023, we entered into a Secured Convertible Credit Agreement (the “Credit Agreement”) with Armata, under which we extended a one-year convertible note (the "Armata Convertible Note") in an aggregate amount of $30.0 million at an interest rate of 8.0% per annum. |  |  |  |  |  |  |
Term loan facility in aggregate amount | $ 30.0 |  |  |  |  |  |  |
Debt Instrument, annual interest rate | 8.00% |  |  |  |  |  |  |
Debt instrument, term | 1 year |  |  |  |  |  |  |
Common stock and warrants |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |
Amount of securities purchase agreement |  |  |  |  |  |  | $ 25.0 |
Unrealized loss |  |  |  | $ 4.2 |  |  |  |
Unrealized gain |  |  | $ 15.8 |  |  |  |  |
Warrants purchased in 2020 |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |
Number of warrants purchased under the securities purchase agreement | shares |  |  |  |  |  |  | 8,710,800 |
Exercise price of warrants | $ / shares | $ 2.87 |  |  |  |  |  |  |
Term of warrants | 5 years |  |  |  |  |  |  |
Warrants purchased in 2021 |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares | $ 3.25 |  |  |  |  |  |  |
Term of warrants | 5 years |  |  |  |  |  |  |
Warrants purchased in 2022 |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares | $ 5.00 |  |  |  |  |  |  |
Term of warrants | 5 years |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |
Equity method investments at fair value |  |  | 13.1 |  |  |  |  | $ 8.1
Common stock |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares |  |  |  |  |  |  | 8,710,800 |
Equity method investments at fair value |  |  | 41.9 |  |  |  |  | $ 31.1
Armata Convertible Note |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |
Equity method investments at fair value |  |  | 32.8 |  |  |  |  |
Unrealized gain |  |  | $ 2.8 |  |  |  |  |
Minimum [Member] | One Director |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |
Armata outstanding shares percentage |  | 8.00% |  |  |  |  |  |
Maximum [Member] | One Director |  |  |  |  |  |  |  |
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 |  |  |  |  | 1,212,122 |  |  |
Number of shares to be purchased under the securities purchase agreement | shares |  | 9,000,000 |  |  |  |  |  |
Number of warrants to be purchased under the securities purchase agreement | shares |  |  |  |  |  | 6,153,847 |  |
Amount of securities purchase agreement |  |  |  |  | $ 4.0 |  |  |

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