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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-based compensation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based compensation costs:
Share-based compensation expense	$ 0	$ 672,223	$ 387,726
Stock options
Share-based compensation costs:
Options amortization period		12 months
September 2016 grant | Stock options
Share-based compensation costs:
Amortized period for options granted		4 months
Cost of Sales
Share-based compensation costs:
Share-based compensation expense		$ 272,811	141,782
Selling and Marketing Expense
Share-based compensation costs:
Share-based compensation expense		143,255	77,583
Research and Development Expense
Share-based compensation costs:
Share-based compensation expense		45,174	23,623
General and Administrative Expense
Share-based compensation costs:
Share-based compensation expense		$ 210,983	$ 144,738

X

- Definition

Weighted average period over which unrecognized compensation is recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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