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Equity and Other Investments and Fair Value Measurements - Equity Investment in Armata (Details) $ / shares in Units, $ in Millions					2 Months Ended	3 Months Ended					9 Months Ended
	Mar. 04, 2024 USD ($)	Jul. 10, 2023 USD ($)	Jan. 10, 2023 USD ($)	Feb. 09, 2022 USD ($) $ / shares shares	Mar. 31, 2022 Tranche	Sep. 30, 2024 USD ($) Director	Sep. 30, 2023 USD ($)	Dec. 31, 2021 USD ($) shares	Mar. 31, 2021 USD ($) shares	Mar. 31, 2020 USD ($) shares	Sep. 30, 2024 USD ($) Director	Sep. 30, 2023 USD ($)	Jan. 01, 2024 $ / shares	Dec. 31, 2023 USD ($)
Armata Convertible Note \| January 2023 Secured Convertible Credit Agreement
Equity Investment
Term loan facility in aggregate amount			$ 30.0
Debt Instrument, annual interest rate			8.00%
Debt instrument maturity date		Jan. 10, 2025
Armata
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					3
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.
Armata \| July 2023 Credit and Security Agreement
Equity Investment
Term loan facility in aggregate amount		$ 25.0
Debt Instrument, annual interest rate		14.00%
Debt instrument maturity date		Jan. 10, 2025
Armata \| March 2024 Credit and Security Agreement
Equity Investment
Term loan facility in aggregate amount	$ 35.0
Debt Instrument, annual interest rate	14.00%
Debt instrument maturity date	Jun. 04, 2025
Armata \| January 2023 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.
Debt instrument, term			1 year
Armata \| Consolidated Investees
Equity Investment
Equity method investment ownership percentage						69.40%					69.40%			69.40%
Armata \| Two Directors
Equity Investment
Armata outstanding shares percentage				12.50%
Armata \| Common stock and warrants
Equity Investment
Amount of securities purchase agreement										$ 25.0
Unrealized gain							$ 72.0					$ 67.9
Unrealized loss						$ 18.2					$ 43.0
Armata \| 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
Armata \| Warrants purchased in 2021
Equity Investment
Exercise price of warrants \| $ / shares													3.25
Term of warrants									5 years
Armata \| Warrants purchased in 2022
Equity Investment
Exercise price of warrants \| $ / shares													$ 5
Term of warrants				5 years
Armata \| Warrants
Equity Investment
Equity and long-term investments at fair value						14.1					14.1			$ 35.3
Armata \| Common stock
Equity Investment
Number of shares to be purchased under the securities purchase agreement \| shares										8,710,800
Equity and long-term investments at fair value						59.4					59.4			81.2
Armata \| Armata Convertible Note
Equity Investment
Equity and long-term investments at fair value						45.5					45.5			51.9
Unrealized gain							18.5					19.6
Unrealized loss						2.2					6.4
Armata \| Armata July 2023 Term Loan
Equity Investment
Equity and long-term investments at fair value						29.4					29.4			$ 27.0
Unrealized gain						1.4	$ 1.1				2.4	$ 1.1
Armata \| Armata March 2024 Term Loan
Equity Investment
Equity and long-term investments at fair value						38.3					38.3
Unrealized gain						$ 2.0					$ 3.3
Minimum [Member] \| Armata \| One Director
Equity Investment
Armata outstanding shares percentage				8.00%
Maximum [Member] \| Armata \| One Director
Equity Investment
Armata outstanding shares percentage				12.50%
Innoviva Strategic Opportunities, LLC \| Armata \| Common stock and warrants
Equity Investment
Amount of securities purchase agreement				$ 45.0					$ 20.0
Innoviva Strategic Opportunities, LLC \| Armata \| Warrants purchased in 2021
Equity Investment
Number of warrants to be purchased under the securities purchase agreement \| shares									6,153,847
Innoviva Strategic Opportunities, LLC \| Armata \| Warrants purchased in 2022
Equity Investment
Number of warrants purchased under the securities purchase agreement \| shares				4,500,000
Innoviva Strategic Opportunities, LLC \| Armata \| Warrants
Equity Investment
Exercise price of warrants \| $ / shares				$ 5
Innoviva Strategic Opportunities, LLC \| Armata \| Common stock
Equity Investment
Number of shares to be purchased under the securities purchase agreement \| shares				9,000,000				1,212,122
Number of warrants to be purchased under the securities purchase agreement \| shares									6,153,847
Amount of securities purchase agreement								$ 4.0