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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-based compensation (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based compensation costs: |  |  |  |
Share-based compensation expense | $ 672,223 | $ 387,726 | $ 0 | $ 0
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 |  |

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- 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. + References No definition available. + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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