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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options, Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 513 | $ 670 | $ 1,703 | $ 2,370 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |
Weighted average exercise price, beginning of period (in dollars per share) |  |  | $ 2.91 | $ 3.43 | $ 3.43
Grants in period, weighted average exercise price (in dollars per share) |  |  | 3.99 |  | 1.77
Exercises in period, weighted average exercise price (in dollars per share) |  |  | 2.65 |  | 1.97
Forfeitures in period, weighted average exercise price (in dollars per share) |  |  | 3.16 |  | 3.26
Expirations in period, weighted average exercise price (in dollars per share) |  |  | 8.14 |  | 4.40
Weighted average exercise price, end of period (in dollars per share) | $ 2.98 |  | $ 2.98 |  | $ 2.91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Number of options, beginning of period (in shares) |  |  | 1,609,087 | 1,487,433 | 1,487,433
Number of grants in period, net of forfeitures (in shares) |  |  | 169,210 |  | 711,414
Number of exercises in period (in shares) |  |  | (615,591) |  | (302,707)
Number of forfeitures in period (in shares) |  |  | (8,049) |  | (188,541)
Number of expirations in period (in shares) |  |  | (51,653) |  | (98,512)
Number of options, end of period (in shares) | 1,103,004 |  | 1,103,004 |  | 1,609,087
Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 42 | $ 134 | $ 281 | $ 508 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |
Exercisable options, weighted average exercise price (in dollars per share) | $ 3.06 |  | $ 3.06 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Number of grants in period, net of forfeitures (in shares) |  |  |  | 710,000 |
Number of exercisable options (in shares) | 888,627 |  | 888,627 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  | 2 years 6 months 14 days |  |
Exercisable options, weighted average remaining contractual term |  |  | 2 years 3 months |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | $ 3,540 |  | $ 3,540 |  |
Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |
Weighted average exercise price, beginning of period (in dollars per share) |  |  | $ 1.70 | $ 1.70 | $ 1.70
Grants in period, weighted average exercise price (in dollars per share) |  |  | 3.89 |  | 1.76
Exercises in period, weighted average exercise price (in dollars per share) |  |  | 1.70 |  | 1.70
Forfeitures in period, weighted average exercise price (in dollars per share) |  |  | 1.76 |  | 1.70
Expirations in period, weighted average exercise price (in dollars per share) |  |  | 1.70 |  | 4.12
Weighted average exercise price, end of period (in dollars per share) | $ 1.70 |  | 1.70 |  | 1.70
Exercisable options, weighted average exercise price (in dollars per share) | 1.70 |  | 1.70 |  |
Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |
Weighted average exercise price, beginning of period (in dollars per share) |  |  | 15.61 | $ 15.61 | 15.61
Grants in period, weighted average exercise price (in dollars per share) |  |  | 7.14 |  | 3.06
Exercises in period, weighted average exercise price (in dollars per share) |  |  | 7.42 |  | 2.92
Forfeitures in period, weighted average exercise price (in dollars per share) |  |  | 5.91 |  | 5.18
Expirations in period, weighted average exercise price (in dollars per share) |  |  | 15.61 |  | 5.22
Weighted average exercise price, end of period (in dollars per share) | 7.42 |  | 7.42 |  | $ 15.61
Exercisable options, weighted average exercise price (in dollars per share) | $ 7.42 |  | $ 7.42 |  |
Maximum | Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Exercisable options, weighted average remaining contractual term |  |  | 10 years |  |
Equity Option |  |  |  |  |
Number of Shares |  |  |  |  |
Number of nonvested shares, beginning of period (in shares) |  |  | 403,990 |  |
Granted, nonvested, number of shares (in shares) |  |  | 169,210 |  |
Vested, number of shares (in shares) |  |  | (350,774) |  |
Nonvested options forfeited, number of shares (in shares) |  |  | (8,049) |  |
Number of nonvested shares, end of period (in shares) | 214,377 |  | 214,377 |  | 403,990
Weighted Average Grant Date Fair Value |  |  |  |  |
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share) |  |  | $ 0.94 |  |
Granted, nonvested, weighted average grant date fair value (in dollars per share) |  |  | 2.06 |  |
Vested, weighted average grant date fair value (in dollars per share) |  |  | 1.23 |  |
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) |  |  | 1.60 |  |
Nonvested, weighted average grant date fair value, end of period (in dollars per share) | $ 1.34 |  | $ 1.34 |  | $ 0.94

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