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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Share-based Compensation) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation $ 4,200,273 $ 2,702,089 $ 3,687,951
Selling, general and administrative expenses [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation 3,679,145 2,501,957 3,323,948
Cost of sales [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation $ 521,128 $ 200,132 $ 364,003