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EQUITY AND LONG-TERM INVESTMENTS AND FAIR VALUE MEASUREMENTS - Equity Investment in ImaginAb (Details) - Imaginab [Member] $ in Millions | Mar. 14, 2023 USD ($) shares | Mar. 18, 2021 USD ($) shares | Dec. 31, 2023 USD ($) Director | Sep. 14, 2023 shares | Dec. 31, 2022 USD ($)
--- | --- | --- | --- | --- | ---
Equity Investment |  |  |  |  |
Transaction costs to acquire equity securities |  | $ 0.4 |  |  |
Number of Investee's Board members currently representing the Company | Director |  |  | 1 |  |
Equity and long-term investments at fair value |  |  | $ 7.6 |  | $ 6.4
Consolidated Investees |  |  |  |  |
Equity Investment |  |  |  |  |
Equity method investment ownership percentage |  |  | 12.40% |  | 12.70%
Series C preferred stock |  |  |  |  |
Equity Investment |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares |  | 4,051,724 |  |  |
Amount of securities purchase agreement |  | $ 4.7 |  |  |
Series C2 Preferred Stock |  |  |  |  |
Equity Investment |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares | 270,568 |  |  | 405,852 |
Amount of securities purchase agreement | $ 0.6 |  |  |  |
One of ImaginAb's Common Stockholders | Common stock |  |  |  |  |
Equity Investment |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares |  | 4,097,157 |  |  |
Amount of securities purchase agreement |  | $ 1.3 |  |  |

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