v3.26.3
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Basis of presentation (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Accumulated deficit $ (3,308,860)   $ (3,157,918)
Net current liabilities (1,709,672)    
Net cash used in operating activities $ (53,728) $ (150,905)