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FAIR VALUE MEASUREMENTS - Valuation of financial instruments (Details) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
FAIR VALUE MEASUREMENTS      
Cash and Cash Equivalents $ 19,700,000 $ 87,100,000  
Restricted cash 57,700,000    
Fair value of warrants   $ 0 $ 0
Foxconn warrants      
FAIR VALUE MEASUREMENTS      
Fair value of warrants $ 300,000