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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					6 Months Ended	9 Months Ended
	Jul. 10, 2023 USD ($)	Jan. 10, 2023 USD ($) $ / shares	Feb. 09, 2022 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) Director	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($) shares	Mar. 31, 2021 USD ($) shares	Mar. 31, 2020 USD ($) shares	Jun. 30, 2023 Tranche	Sep. 30, 2023 USD ($) Director	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
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						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.
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
Consolidated Investees
Equity investment
Equity method investment ownership percentage				69.40%						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											$ 35.3
Unrealized gain					$ 11.7
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
Term of warrants		5 years
Warrants
Equity investment
Equity method investments at fair value				$ 31.8						$ 31.8		$ 8.1
Unrealized gain										67.9
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				75.2						75.2		$ 31.1
Unrealized gain				72.0
Armata Convertible Note
Equity investment
Equity method investments at fair value				49.7						49.7
Unrealized gain				18.5						19.6
Armata Term Loan
Equity investment
Equity method investments at fair value				26.2						26.2
Unrealized gain				$ 1.1						$ 1.1
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
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