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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grants in period, weighted average exercise price (in dollars per share) |  |  | $ 3.94 |  | $ 1.77 |
Number of options (in shares) | 1,183,303 |  | 1,183,303 |  | 1,609,087 | 1,487,433
Outstanding options, weighted average exercise price (in dollars per share) | $ 2.97 |  | $ 2.97 |  | $ 2.91 | $ 3.43
Stock Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) | 14,859,770 |  | 14,859,770 |  |  |
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 5 months 23 days |  |  |
Number of grants in period (in shares) |  |  | 160,000 | 570,000 |  |
Number of options (in shares) | 1,180,000 |  | 1,180,000 |  |  |
Number of exercisable options (in shares) | 900,000 |  | 900,000 |  |  |
Outstanding options, weighted average exercise price (in dollars per share) | $ 2.97 |  | $ 2.97 |  |  |
Exercisable options, weighted average exercise price (in dollars per share) | $ 3.15 |  | $ 3.15 |  |  |
Options, vested and expected to Vest, aggregate intrinsic value | $ 2,700,000 |  | $ 2,700,000 |  |  |
Share-based compensation | 40,000.00 | $ 30,000.00 | 240,000 | $ 290,000 |  |
Unrecognized compensation costs related to unvested stock options |  |  | $ 130,000 |  |  |
Share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition |  |  | 1 year 5 months 1 day |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  | 2 years 8 months 23 days |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |
Granted, nonvested, number of shares (in shares) |  |  | 440,000 | 740,000 |  |
Grants in period, grant date intrinsic value (in dollars per share) |  |  | $ 2,670,000 | $ 1,540,000 |  |
Share-based compensation | 390,000 | 350,000 | $ 750,000 | $ 760,000 |  |
Unrecognized compensation costs related to RSU awards |  |  | $ 1,490,000 |  |  |
Share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition |  |  | 2 years 3 months 29 days |  |  |
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
Grants in period, weighted average exercise price (in dollars per share) |  |  |  |  |  | $ 1.25
Granted, nonvested, number of shares (in shares) |  |  | 0 |  | 0 |
Share-based compensation | $ 60,000.00 | $ 330,000 | $ 200,000 | $ 660,000 |  |
Unrecognized compensation costs related to RSU awards |  |  | $ 80,000.00 |  |  |
Share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition |  |  | 3 months 21 days |  |  |
Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grants in period, weighted average exercise price (in dollars per share) |  |  | $ 7.14 |  | $ 3.06 |
Outstanding options, weighted average exercise price (in dollars per share) | $ 7.42 |  | $ 7.42 |  | $ 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
Period of exercise price |  |  |  |  |  | 90 days
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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