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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grants in period, weighted average exercise price (in dollars per share) | $ 2.92 |  | $ 2.92 | $ 1.75 |  |
Number of options (in shares) | 1,590,897 |  | 1,590,897 |  | 1,732,754 | 2,028,847
Outstanding options, weighted average exercise price (in dollars per share) | $ 3.40 |  | $ 3.40 |  | $ 3.84 | $ 4.48
Number of grants in period, net of forfeitures (in shares) |  |  | 296,450 | 442,956 |  |
Share-based compensation | $ 660,000 | $ 520,000 | $ 1,780,000 | $ 1,720,000 |  |
Stock Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) | 9,555,135.7 |  | 9,555,135.7 |  |  |
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 |  |  | 3 years 5 months 1 day |  |  |
Number of grants in period (in shares) |  |  | 300,000 | 420,000 |  |
Number of options (in shares) | 1,600,000 |  | 1,600,000 |  |  |
Number of exercisable options (in shares) | 1,350,000 |  | 1,350,000 |  |  |
Outstanding options, weighted average exercise price (in dollars per share) | $ 3.40 |  | $ 3.40 |  |  |
Exercisable options, weighted average exercise price (in dollars per share) | $ 3.56 |  | $ 3.56 |  |  |
Options, vested and expected to Vest, aggregate intrinsic value | $ 667,957 |  | $ 667,957 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |
Number of grants in period, net of forfeitures (in shares) |  |  | 720,000 | 1,190,000 |  |
Grants in period, grant date intrinsic value (in dollars per share) |  |  | $ 2,440,000 | $ 2,410,000 |  |
Unrecognized compensation costs related to unvested stock options |  |  | $ 110,000 |  |  |
Unrecognized compensation costs related to RSU awards |  |  | $ 1,290,000 |  |  |
Share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition |  |  | 2 years |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 5 years |  |  |
Number of grants 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 |  |  | $ 2,040,000 |  |  |
Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grants in period, weighted average exercise price (in dollars per share) |  |  |  |  | 2.88 |
Outstanding options, weighted average exercise price (in dollars per share) | $ 15.61 |  | $ 15.61 |  | $ 15.61 | $ 15.61
Maximum | Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Exercisable options, weighted average remaining contractual term |  |  | 10 years |  |  |
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 |  |  |
Period of exercise price |  |  | 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 |  |  |
Period of exercise price |  |  | 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 |  |  |
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 |  |  |

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