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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Equity Investment in Entasis (Details) - Entasis
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 27, 2020
USD ($)
$ / shares
shares
Apr. 12, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
tranche
item
Equity Investment      
Number of tranches | tranche     2
Number of investee's board members which may be designated by the Company | item     2
Equity investment ownership percentage     51.00%
Unrealized gain from fair value changes in equity investments     $ 30.5
Common stock and warrants      
Equity Investment      
Amount of securities purchase agreement $ 12.5 $ 35.0  
Equity and long-term investments at fair value     78.0
Common stock      
Equity Investment      
Number of shares to be purchased under the securities purchase agreement | shares 4,672,897 14,000,000  
Equity and long-term investments at fair value     $ 46.1
Warrants      
Equity Investment      
Maximum number of additional shares into which warrants may be converted under the securities purchase agreement | shares 4,672,897 14,000,000  
Exercise price of warrants | $ / shares $ 2.675 $ 2.50  
Term of warrants     5 years
Equity and long-term investments at fair value     $ 31.9