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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-based compensation (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based compensation costs:        
Share-based compensation expense $ 182,551 $ 84,651 $ 652,860 $ 84,651
Cost of sales        
Share-based compensation costs:        
Share-based compensation expense 74,683 37,995 270,800 37,995
Sales and marketing        
Share-based compensation costs:        
Share-based compensation expense 38,578 20,723 143,255 20,723
Research and development        
Share-based compensation costs:        
Share-based compensation expense 12,458 6,310 45,174 6,310
General and administrative        
Share-based compensation costs:        
Share-based compensation expense $ 56,832 $ 19,623 $ 193,631 $ 19,623