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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Equity Investment in Armata (Details) - Armata
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 27, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
item
tranche
$ / shares
Equity Investment    
Number of tranches | tranche   2
Number of Innoviva board members who joined investee's board | item   2
Equity investment ownership percentage   46.60%
Unrealized gain from fair value changes in equity investments   $ 19.0
Common stock and warrants    
Equity Investment    
Amount of securities purchase agreement $ 25.0  
Equity and long-term investments at fair value   44.0
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   $ 26.0
Warrants    
Equity Investment    
Maximum number of additional shares into which warrants may be converted under the securities purchase agreement | shares 8,710,800  
Exercise price of warrants | $ / shares   $ 2.87
Term of warrants   5 years
Equity and long-term investments at fair value   $ 18.0