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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Share-based Compensation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation $ 10,077 $ 17,908 $ 17,897
Selling, general and administrative expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation 8,389 15,929 15,463
Cost of revenues [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation 1,586 1,857 2,084
Research and development expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation $ 102 $ 122 $ 350