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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Equity Investment in ImaginAb (Details) - ImaginAb $ in Millions | Mar. 18, 2021 USD ($) shares | Dec. 31, 2021 USD ($) Director
--- | --- | ---
Equity Investment |  |
Payments of Stock Issuance Costs | $ 0.4 |
Number of Investee's Board members currently representing the Company | Director |  | 1
Number of the Investee's Board members | Director |  | 5
Equity investment ownership percentage |  | 14.50%
Equity and long-term investments at fair value |  | $ 6.4
Series C Preferred Stock [Member] |  |
Equity Investment |  |
Securities to be purchased | shares | 4,051,724 |
Amount of securities purchase agreement | $ 4.7 |
Common Stock [Member] | One Of Imaginabs Common Stockholder [Member] |  |
Equity Investment |  |
Securities to be purchased | shares | 4,097,157 |
Amount of securities purchase agreement | $ 1.3 |

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