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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Equity Investment in Armata (Details) - Armata $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 28, 2021 USD ($) shares | Jan. 26, 2021 USD ($) shares | Mar. 31, 2021 Tranche | Mar. 31, 2020 USD ($) shares | Dec. 31, 2021 USD ($) Director $ / shares | Dec. 31, 2020 USD ($) $ / shares
Equity Investment |  |  |  |  |  |
Number of Investee's Board members currently representing the Company | Director |  |  |  |  | 3 |
Number of the Investee's Board members | Director |  |  |  |  | 8 |
Equity investment ownership percentage |  |  | 59.60% |  | 59.30% | 46.60%
Unrealized gain from fair value changes in equity investments |  |  |  |  | $ 78.7 | $ 19.0
Percentage of maximum voting rights |  |  |  |  | 49.50% |
Innoviva Strategic Opportunities, LLC |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Number of tranches | Tranche |  |  | 2 |  |  |
Common Stock And Warrants [Member] |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Amount of securities purchase agreement |  |  |  | $ 25.0 |  |
Equity and long-term investments at fair value |  |  |  |  | $ 146.7 | 44.0
Common Stock And Warrants [Member] | Innoviva Strategic Opportunities, LLC |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Amount of securities purchase agreement |  | $ 20.0 |  |  |  |
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 |  |  |  | 8,710,800 |  |
Amount of securities purchase agreement | $ 4.0 |  |  |  |  |
Equity and long-term investments at fair value |  |  |  |  | $ 88.1 | $ 26.0
Common stock | Innoviva Strategic Opportunities, LLC |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares |  | 6,153,847 |  |  |  |
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 |  |  |  |  | $ 58.6 | $ 18.0
Maximum number of additional shares into which warrants may be converted under the securities purchase agreement | shares |  |  |  | 8,710,800 |  |
Warrants | Innoviva Strategic Opportunities, LLC |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Number of warrants to be purchased under the securities purchase agreement | shares |  | 6,153,847 |  |  |  |
Warrants purchased in 2021 |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Exercise price of warrants | $ / shares |  |  |  |  | $ 3.25 |

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