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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 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 | $ 1.75 |  |
Number of options (in shares) | 1,684,775 |  | 1,732,754 | 2,028,847
Outstanding options, weighted average exercise price (in dollars per share) | $ 3.32 |  | $ 3.84 | $ 4.48
Number of grants in period, net of forfeitures (in shares) | 354,844 | 442,956 |  |
Share-based compensation | $ 1,120,000 | $ 1,200,000 |  |
Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock, shares authorized (in shares) | 9,310,268.2 |  |  |
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 8 months 9 days |  |  |
Number of grants in period (in shares) | 350,000 | 420,000 |  |
Number of options (in shares) | 1,680,000 |  |  |
Number of exercisable options (in shares) | 1,400,000 |  |  |
Outstanding options, weighted average exercise price (in dollars per share) | $ 3.32 |  |  |
Exercisable options, weighted average exercise price (in dollars per share) | $ 3.48 |  |  |
Options, vested and expected to Vest, aggregate intrinsic value | $ 896,473 |  |  |
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 | 1,130,000 |  |
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 | $ 200,000 |  |  |
Unrecognized compensation costs related to RSU awards | $ 1,640,000 |  |  |
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 | $ 2,400,000 |  |  |
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
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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