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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Restricted Stock, Restricted Stock Units Activity and SAR's (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Payment Arrangement, Expense | $ 360 | $ 410 |
Number of Shares |  |  |
Granted, nonvested, number of shares (in shares) | 440,000 | 740,000 |
Restricted Stock Units (RSUs) | Equity Option |  |  |
Number of Shares |  |  |
Number of nonvested shares, beginning of period (in shares) | 1,094,056 |  |
Granted, nonvested, number of shares (in shares) | 441,241 |  |
Vested, number of shares (in shares) | (635,233) |  |
Nonvested options forfeited, number of shares (in shares) | 0 |  |
Number of nonvested shares, end of period (in shares) | 900,064 |  | 1,094,056
Weighted Average Grant Date Fair Value |  |  |
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share) | $ 1.98 |  |
Granted, nonvested, weighted average grant date fair value (in dollars per share) | 3.89 |  |
Vested, weighted average grant date fair value (in dollars per share) | 1.94 |  |
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) | 0 |  |
Nonvested, weighted average grant date fair value, end of period (in dollars per share) | $ 2.94 |  | $ 1.98
Stock Appreciation Rights (SARs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Payment Arrangement, Expense | $ 140 | $ 330 |
Number of Shares |  |  |
Number of nonvested shares, beginning of period (in shares) | 1,720,623 | 2,165,509 | 2,165,509
Granted, nonvested, number of shares (in shares) | 0 |  | 0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised | 0 |  | 0
Nonvested options forfeited, number of shares (in shares) | 0 |  | (444,886)
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Expirations | 0 |  | 0
Number of nonvested shares, end of period (in shares) | 1,720,623 |  | 1,720,623
Weighted Average Grant Date Fair Value |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercised, Weighted Average Exercise Price | $ 0 |  | $ 0
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share) | 2.92 | $ 2.92 | 2.92
Granted, nonvested, weighted average grant date fair value (in dollars per share) | 0 |  | 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expired, Weighted Average Grant Date Fair | 0 |  | 0
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) | 0 |  | 2.92
Nonvested, weighted average grant date fair value, end of period (in dollars per share) | $ 2.92 |  | $ 2.92
Stock Appreciation Rights (SARs) | Equity Option |  |  |
Number of Shares |  |  |
Number of nonvested shares, beginning of period (in shares) | 1,720,623 |  |
Granted, nonvested, number of shares (in shares) | 0 |  |
Vested, number of shares (in shares) | (573,537) |  |
Nonvested options forfeited, number of shares (in shares) | 0 |  |
Number of nonvested shares, end of period (in shares) | 1,147,086 |  | 1,720,623
Weighted Average Grant Date Fair Value |  |  |
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share) | $ 1.25 |  |
Granted, nonvested, weighted average grant date fair value (in dollars per share) | 0 |  |
Vested, weighted average grant date fair value (in dollars per share) | 1.25 |  |
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) | 0 |  |
Nonvested, weighted average grant date fair value, end of period (in dollars per share) | $ 1.25 |  | $ 1.25

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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