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EMPLOYEE STOCK OPTIONS, RESTRICTED STOCK AWARD PLAN AND 401(k) - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2013 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 665,160 | 668,340 | 684,020 |  |  | 668,340 |  | 665,160 |  |  | 28,955 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options |  |  |  |  |  |  |  |  |  | $ 702,934 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  |  | 1 year 6 months |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  | $ 278,400 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  |  |  |  |  |  |  | $ 278,400 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased | $ 1.64 | $ 3.25 | $ 5.87 | $ 9.91 |  | $ 3.25 |  | $ 1.64 | $ 9.91 | $ 2.64 |  |  |  |
Compensation Expenses Charged Against Income For Share Based Awards Included In General And Administrative Expenses | $ 792,836 | $ 808,734 | $ 834,465 | $ 1,007,789 | $ 1,081,199 | $ 1,643,199 | $ 2,083,547 | $ 2,436,035 | $ 3,091,336 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  |  |  |  |  |  | $ 1,470,230 | $ 1,744,047 |  |
Share-based Compensation |  |  | 834,465 |  |  | 1,643,199 |  | 2,436,035 |  | $ 3,082,625 | $ 3,870,934 | $ 3,685,079 |  |
Employer's matching contributions |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | 919,908 | 1,239,664 | $ 1,501,300 |  |  | $ 1,239,664 |  | $ 919,908 |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  | 1 year 9 months 18 days |  |  | 1 year 8 months 12 days |  | 1 year 7 months 6 days |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  |  |  |  |  |  |  | 193,000 | 165,400 |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  | $ 625,855 | $ 1,853,913 | $ 3,618,309 |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ 3,451,385 | $ 4,046,963 | $ 2,547,688 |  |  | $ 4,046,963 |  | $ 3,451,385 |  | $ 4,451,903 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  | 2 years 3 months 18 days |  |  | 1 year 10 months 24 days |  | 1 year 1 month 6 days |  | 1 year 9 months 18 days |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  | $ 2,456,770 | $ 2,017,021 | $ 66,770 |  |
number of restricted stock vested |  |  | 0 |  |  | 400 |  | 900 | 0 | 187,136 | 64,620 | 0 |  |
aggregate intrinsic value of vested restricted stock |  |  |  |  |  |  |  |  |  | $ 494,605 | $ 304,360 |  |  |

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