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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-based compensation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Share-based compensation costs:    
Share-based compensation expense $ 235,411 $ 470,309
Cost of sales    
Share-based compensation costs:    
Share-based compensation expense 98,356 196,117
Sales and marketing    
Share-based compensation costs:    
Share-based compensation expense 51,993 104,677
Research and development    
Share-based compensation costs:    
Share-based compensation expense 16,407 32,715
General and administrative    
Share-based compensation costs:    
Share-based compensation expense $ 68,655 $ 136,800