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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-based compensation (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
Share-based compensation costs:  
Share-based compensation expense $ 234,898
Cost of sales  
Share-based compensation costs:  
Share-based compensation expense 97,761
Sales and marketing  
Share-based compensation costs:  
Share-based compensation expense 52,684
Research and development  
Share-based compensation costs:  
Share-based compensation expense 16,308
General and administrative  
Share-based compensation costs:  
Share-based compensation expense $ 68,145