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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-based compensation (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based compensation expense | $ 0 | $ 0 | $ 672,223 |
Cost of sales |  |  |  |
Share-based compensation expense |  |  | 272,811 |
Sales and marketing |  |  |  |
Share-based compensation expense |  |  | 143,255 |
Research and development |  |  |  |
Share-based compensation expense |  |  | 45,174 |
General and administrative |  |  |  |
Share-based compensation expense |  |  | $ 210,983 |
Stock options |  |  |  |
Options amortization period |  |  |  | 12 months
Amortized period for options granted |  |  | 4 months |

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