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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%