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EQUITY AND LONG-TERM INVESTMENTS AND FAIR VALUE MEASUREMENTS - Equity Investment in InCarda (Details) - InCarda $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 15, 2022 USD ($) $ / shares shares | Mar. 09, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2020 USD ($) shares | Dec. 31, 2023 USD ($) Director | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Equity Investment |  |  |  |  |  |  |  |
Number of Investee's Board members currently representing the Company | Director |  |  |  |  |  | 6 |  |
Unrealized gain loss from fair value changes in equity investments |  |  |  |  |  | $ 3.1 |  |
Carrying value wrote off warrant exercise |  |  |  |  |  | $ 0.1 |  |
Unrealized loss from fair value changes in equity investments |  |  |  |  |  |  | $ 8.7 | $ 0.7
Consolidated Investees [Member] |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Equity investment ownership percentage |  |  |  |  |  | 8.10% | 9.00% |
Series C preferred stock and warrants |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Amount of securities purchase agreement |  |  |  |  | $ 15.8 |  |  |
Warrants |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Maximum number of additional shares into which warrants may be converted under the securities purchase agreement | shares |  |  |  |  | 5,117,358 |  |  |
Extended expiration date |  |  |  |  |  | Mar. 31, 2023 |  |
Convertible note and warrants |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Amount of securities purchase agreement |  | $ 0.7 |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | shares | 4,093,886 |  |  |  |  |  |  |
Series A1 preferred stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | shares | 37,350 |  |  |  |  |  |  |
Series D 1 Preferred Stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | shares | 8,771,780 |  |  |  |  |  |  |
Series D 2 Preferred Stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | shares | 3,369,802 |  |  |  |  |  |  |
Series D1 Warrant |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | shares | 2,490,033 |  |  |  |  |  |  |
Exercise price of warrants | $ / shares | $ 0.2 |  |  |  |  |  |  |
Series C preferred stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares |  |  |  |  | 20,469,432 |  |  |
Debt Conversion, Converted Instrument, Shares Issued | shares | 5,117,358 |  |  |  |  |  |  |
Transaction cost |  |  |  |  | $ 0.8 |  |  |
Equity and long-term investments at fair value |  |  |  |  |  | $ 4.8 | $ 6.8 |
Impairment of equity investments |  |  | $ 2.9 | $ 9.0 |  |  |  |
Exercise price of warrants | $ / shares | $ 0.73 |  |  |  |  |  |  |
Series C Warrants and Series D Warrants |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Equity and long-term investments at fair value |  |  |  |  |  |  | 0.6 |
Series D Warrants |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Equity and long-term investments at fair value |  |  |  |  |  | 0.1 |  |
Series D Preferred Stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Payments to acquire equity securities | $ 2.3 |  |  |  |  |  |  |
Series D 1 And D 2 Preferred Stock And Common Stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Equity and long-term investments at fair value |  |  |  |  |  | $ 2.7 | $ 3.2 |
Significant Unobservable Inputs, Level 3 | Backsolve Valuation |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Expected Holding Period |  |  |  | 2 years |  | 2 years |  |
Risk Free Interest Rate |  |  |  | 3.20% |  | 4.90% |  |
Dividend Yield |  |  |  | 0.00% |  | 0.00% |  |
Estimated volatility |  |  |  | 122.00% |  | 114.20% |  |

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