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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings (loss) per share (Details) - ADSs - shares
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Employee Stock Option        
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES        
Antidilutive securities 180,055 7,943 180,055 7,943
Outstanding warrants        
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES        
Antidilutive securities 1,108,159 256,809 1,108,159 256,809