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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Parent Company Condensed Statements of Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION      
Total operating expenses $ (838,120) $ (689,720) $ (113,499)
Interest expenses 10,200 8,542 3,615
Foreign currency exchange gains (losses), net 42 (11,505) 798
Changes in fair values of convertible notes, excluding impact of instrument-specific credit risk 4,448 13,162 1,065
Changes in fair values of put options (2,508)    
Loss before income taxes (749,142) (724,271) (108,678)
Income tax expense 1,113 292 1,853
Net loss attributable to ordinary shareholders (742,001) (723,921) (110,531)
Other comprehensive income (loss)      
Total comprehensive loss attributable to ordinary shareholders (734,441) (706,145) (111,255)
Parent Company      
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION      
Total operating expenses (2,983) (11,127) (263)
Interest income 6,979 2,839  
Investment loss, net (5,084) (4,242)  
Foreign currency exchange gains (losses), net (171) (13,068) 2,124
Changes in fair values of convertible notes, excluding impact of instrument-specific credit risk (616)    
Changes in fair values of put options (2,508)    
Share of losses from subsidiaries and consolidated VIEs (737,618) (698,323) (112,392)
Loss before income taxes (742,001) (723,921) (110,531)
Net loss attributable to ordinary shareholders (742,001) (723,921) (110,531)
Other comprehensive income (loss)      
Fair value changes of mandatorily redeemable noncontrolling interest, exchangeable notes and convertible notes due to instrument-specific credit risk, net of nil income taxes (8,650) (893) 119
Foreign currency translation adjustment, net of nil income taxes 16,210 18,669 (843)
Total comprehensive loss attributable to ordinary shareholders $ (734,441) $ (706,145) $ (111,255)