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DEBT - ADS Lending Arrangement (Details) - ADS Lending Arrangement - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2021
Dec. 31, 2020
May 31, 2018
Apr. 30, 2018
Debt Instrument [Line Items]          
Number of Loaned ADS lent 2,606,278        
ADS par value per share $ 0.0004        
ADS to ordinary share ratio       1 4
Loand ADS outstanding   10,425,112 10,425,112