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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Share-based Compensation) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation $ 17,896,942 $ 13,788,049 $ 4,200,273
Selling, General and Administrative Expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation 15,463,171 12,461,838 3,679,145
Cost of Sales [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation 2,083,771 $ 1,326,211 $ 521,128
Research and Development Expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation $ 350,000