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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Parent Company Condensed Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current assets      
Cash $ 418,941 $ 736,605 $ 531,452
Total current assets 883,712 823,463  
Non-current assets      
Total non-current assets 700,966 548,489  
Total assets 1,584,678 1,371,952  
Current liabilities      
Convertible notes 20,277    
Total current liabilities 1,757,281 932,879  
Non-current liabilities      
Put option liabilities 11,884    
Total non-current liabilities 654,569 523,679  
Total liabilities 2,411,850 1,456,558  
Shareholders' equity (deficit)      
Ordinary Shares 21 21  
Additional paid-in capital 358,187 403,103  
Receivable from shareholders   (26,447)  
Accumulated other comprehensive income (loss) 25,267 17,707  
Accumulated deficit (1,588,773) (846,757)  
Total shareholders' deficit attributable to ordinary shareholders (1,205,298) (452,373)  
Total liabilities, mezzanine equity and shareholders' deficit 1,584,678 1,371,952  
Related party      
Current assets      
Prepayments and other current assets 28,744 8,732  
Current liabilities      
Accrued expenses and other current liabilities 290,686 183,237  
Nonrelated Party      
Current assets      
Prepayments and other current assets 63,870 44,375  
Current liabilities      
Accrued expenses and other current liabilities 419,422 323,299  
Parent Company      
Current assets      
Cash 33,888 353,107  
Amounts due from inter-companies 46,087 6,089  
Total current assets 81,662 359,196  
Non-current assets      
Investment securities - related parties $ 3,326 8,411  
Debt Securities, Available-for-Sale, Type [Extensible Enumeration] Related party    
Total non-current assets $ 3,326 8,411  
Total assets 84,988 367,607  
Current liabilities      
Convertible notes 20,277    
Accrued expenses and other current liabilities 714    
Total current liabilities 20,991    
Non-current liabilities      
Share of losses in excess of investments in subsidiaries and consolidated VIEs 873,881 451,571  
Total non-current liabilities 885,765 451,571  
Total liabilities 906,756 451,571  
Total mezzanine equity 383,530 368,409  
Shareholders' equity (deficit)      
Ordinary Shares 21 21  
Additional paid-in capital 358,187 403,103  
Receivable from shareholders   (26,447)  
Accumulated other comprehensive income (loss) 25,267 17,707  
Accumulated deficit (1,588,773) (846,757)  
Total shareholders' deficit attributable to ordinary shareholders (1,205,298) (452,373)  
Total liabilities, mezzanine equity and shareholders' deficit 84,988 $ 367,607  
Parent Company | Nonrelated Party      
Current assets      
Prepayments and other current assets $ 1,687