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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options granted in period (in shares) |  |  | 296,450 | 442,956 | 738,893 |
Number of options (in shares) |  |  | 1,487,433 | 1,732,754 | 2,028,847 | 2,045,143
Outstanding options, weighted average exercise price (in dollars per share) |  |  | $ 3.43 | $ 3.84 | $ 4.48 | $ 5.69
Number of exercises in period (in shares) |  |  | 54,805 | 355,092 | 0 |
Shares issued for consulting services |  |  | $ 146,000 | $ 764,000 | $ 370,000 |
Grants in period, weighted average exercise price (in dollars per share) |  |  | $ 2.92 | $ 1.75 | $ 2.34 |
Stock Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 10,073,588.9 |  |  |
Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 2 years |  |  |
Award exercise period |  |  | 5 years |  |  |
Exercisable options, weighted average remaining contractual term |  |  | 2 years 11 months 26 days |  |  |
Stock options granted in period (in shares) |  |  | 300,000 | 420,000 | 740,000 |
Number of options (in shares) |  |  | 1,490,000 |  |  |
Number of exercisable options (in shares) |  |  | 1,260,000 |  |  |
Options, vested and expected to Vest, aggregate intrinsic value |  |  | $ 52,085 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |
Number of exercises in period (in shares) |  |  | 54,805 | 355,092 | 0 |
Exercisable options, weighted average exercise price (in dollars per share) |  |  | $ 2.27 | $ 2.15 |  |
Shares issued for consulting services |  |  | $ 70,000 | $ 760,000 |  |
Exercisable options, intrinsic value |  |  | $ 50,000 | $ 410,000 |  |
Number of RSUs granted in period (in shares) |  |  | 730,000 | 1,190,000 | 1,390,000 |
Grants in period, grant date intrinsic value (in dollars per share) |  |  | $ 2,510,000 | $ 1,486,126 | $ 1,693,303 |
Unrecognized compensation costs related to unvested stock options |  |  | $ 40,000 |  |  |
Unrecognized compensation costs related to RSU awards |  |  | 880,000 |  |  |
Recognition period for unrecognized compensation costs | 2 years |  |  |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period | 5 years |  |  |  |  |
Stock options granted in period (in shares) | 2,200,000 | 0 |  |  |  |
Grants in period, weighted average exercise price (in dollars per share) | $ 1.25 |  |  |  |  |
Unrecognized compensation costs related to RSU awards |  |  | $ 1,380,000 |  |  |
Maximum | Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Exercisable options, weighted average remaining contractual term |  |  | 10 years |  |  |
Outstanding options, weighted average exercise price (in dollars per share) |  |  | $ 3.60 |  |  |
Minimum | Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Outstanding options, weighted average exercise price (in dollars per share) |  |  | $ 3.43 |  |  |
Common Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of exercises in period (in shares) |  |  |  |  | 206,612 |
Shares issued for consulting services |  |  | $ 146,000 | $ 764,000 | $ 370,000 |
Common Stock | Stock Appreciation Rights (SARs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grants in period, weighted average exercise price (in dollars per share) | 2.92 |  |  |  |  |
Share-based Compensation Award, Tranche One | Stock Appreciation Rights (SARs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grants in period, weighted average exercise price (in dollars per share) | $ 5.00 |  |  |  |  |
Exercised in period (in shares) | 90 days |  |  |  |  |
Share-based Compensation Award, Tranche Two | Stock Appreciation Rights (SARs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grants in period, weighted average exercise price (in dollars per share) | $ 7.00 |  |  |  |  |
Exercised in period (in shares) | 90 days |  |  |  |  |
Share-based Compensation Award, Tranche Three | Stock Appreciation Rights (SARs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grants in period, weighted average exercise price (in dollars per share) | $ 10.00 |  |  |  |  |

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