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STOCK OPTIONS - NARRATIVE (Details) - USD ($) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 31, 2017 | Jul. 31, 2015 | Jul. 31, 2012 | Oct. 30, 2007 | Dec. 31, 2001
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Option expiration period (in years) | 10 years |  |  |  |  |  |  |
Option vesting period (in years) | 7 years |  |  |  |  |  |  |
Aggregate intrinsic value of all stock options outstanding and expected to vest | $ 11,954,354 | $ 1,306,791 |  |  |  |  |  |
Aggregate intrinsic value of currently exercisable stock options | $ 6,976,636 | $ 768,706 |  |  |  |  |  |
Closing stock price for computation of intrinsic value (in dollars per share) | $ 6.48 | $ 2.60 |  |  |  |  |  |
Number of in-the-money options outstanding and exercisable | 5,310,711 | 2,318,887 |  |  |  |  |  |
Intrinsic value of options exercised | $ 4,460,842 | $ 223,340 | $ 119,026 |  |  |  |  |
Proceeds from stock options exercised | 202,575 | 0 | 12,300 |  |  |  |  |
Intrinsic value of options granted | 540,000 | 3,144,960 | 1,516,125 |  |  |  |  |
Fair value of option shares vested | $ (1,435,173) | $ (805,747) | $ (612,464) |  |  |  |  |
Shares issued in stock swaps | 808,272 | 47,372 | 9,614 |  |  |  |  |
Unrecognized stock-based compensation cost | $ 1,900,000 |  |  |  |  |  |  |
Unrecognized stock-based compensation cost, recognition period (in years) |  | 4 years |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares received in stock swaps | 570,343 | 129,378 | 26,636 |  |  |  |  |
Stock Option |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares received in stock swaps | 1,378,615 | 176,750 | 36,250 |  |  |  |  |
2001 Executive and Employee Stock Option Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized under common stock option plans |  |  |  |  |  |  |  | 1,200,000
2003 Executive and Employee Stock Option Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized under common stock option plans |  |  |  |  |  |  | 1,700,000 |
2012 Share Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized under common stock option plans |  |  |  |  |  | 750,000 |  |
Remaining shares for issuance (in shares) | 70,000 |  |  |  |  |  |  |
2015 Executive and Employee Stock Option Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized under common stock option plans |  |  |  |  | 2,000,000 |  |  |
Remaining shares for issuance (in shares) | 326,000 |  |  |  |  |  |  |
2017 Executive and Employee Stock Option Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized under common stock option plans |  |  |  | 3,000,000 |  |  |  |
Remaining shares for issuance (in shares) | 1,783,000 |  |  |  |  |  |  |

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