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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options, Activity (Details) - $ / shares | 6 Months Ended | 12 Months Ended
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Jun. 30, 2021 | Dec. 31, 2020
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
Grants in period, weighted average exercise price (in dollars per share) | 3.94 | 1.77
Exercises in period, weighted average exercise price (in dollars per share) | 2.60 | 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) | $ 2.97 | $ 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
Number of grants in period, net of forfeitures (in shares) | 163,988 | 711,414
Number of exercises in period (in shares) | (530,070) | (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) | 1,183,303 | 1,609,087
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
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
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
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) | 5.18 | 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 | $ 15.61
Equity Option |  |
Number of Shares |  |
Number of nonvested shares, beginning of period (in shares) | 403,990 |
Granted, nonvested, number of shares (in shares) | 163,988 |
Vested, number of shares (in shares) | (280,438) |
Nonvested options forfeited, number of shares (in shares) | (8,049) |
Number of nonvested shares, end of period (in shares) | 279,491 | 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) | 2.03 |
Vested, weighted average grant date fair value (in dollars per share) | 1.35 |
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) | $ 1.15 | $ 0.94

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