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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 12 Months Ended
Jul. 10, 2023
USD ($)
Jan. 10, 2023
USD ($)
Feb. 09, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
shares
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2023
USD ($)
Tranche
Director
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jan. 01, 2024
$ / shares
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      
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                  
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 invested in 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                
Term loan facility in aggregate amount   $ 30.0                
Debt Instrument, annual interest rate   8.00%                
Consolidated Investees [Member]                    
Equity Investment                    
Equity method investment ownership percentage             69.40%      
Two Directors                    
Equity Investment                    
Armata outstanding shares percentage     12.50%              
Common stock and warrants                    
Equity Investment                    
Amount of securities purchase agreement           $ 25.0        
Unrealized gain             $ 77.4   $ 78.7  
Unrealized loss               $ 152.5    
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 and long-term investments at fair value             35.3 8.1    
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             81.2 $ 31.1    
Armata Convertible Note                    
Equity Investment                    
Equity and long-term investments at fair value             51.9      
Unrealized gain             21.8      
Armata Term Loan                    
Equity Investment                    
Equity and long-term investments at fair value             27.0      
Unrealized gain             $ 2.0      
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     9,000,000              
Number of shares to be purchased under the securities purchase agreement | shares       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