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STOCK OPTION GRANTS AND EXERCISES - EXERCISES (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2009 | Dec. 31, 2008
STOCK OPTION EXERCISES |  |  |  |  |
Aggregate consideration from issue of common stock |  |  | $ 855,021 |  |
Stock Option |  |  |  |  |
STOCK OPTION EXERCISES |  |  |  |  |
Number of common stock issued on exercise of stock options (in shares) | 0 | 0 | 1,046,580 |  |
Aggregate consideration from issue of common stock |  |  | $ 855,021 |  |
Granted (in dollars per share) |  |  |  | $ 1.30 | $ 0.81

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