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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 | 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 |
Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Payment Arrangement, Expense | 42 | 134 | 281 | 508 |
Weighted Average Grant Date Fair Value |  |  |  |  |
Unrecognized Compensation Costs Related To Unvested Stock Options |  |  | 100 |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 409 | 306 | $ 1,162 | $ 986 |
Number of Shares |  |  |  |  |
Granted, nonvested, number of shares (in shares) |  |  | 440,000 | 740,000 |
Weighted Average Grant Date Fair Value |  |  |  |  |
Unrecognized Compensation Costs Related To R S U Awards |  |  | $ 1,080 |  |
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 |  | 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 |  | $ 2.94 |  | $ 1.98
Stock Appreciation Rights (SARs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 62 | $ 230 | $ 260 | $ 876 |
Number of Shares |  |  |  |  |
Number of nonvested shares, beginning of period (in shares) |  |  | 2.92 | 2.92 | 2.92
Granted, nonvested, number of shares (in shares) |  |  | 0 |  | 0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised |  |  | 2.92 |  | 0
Nonvested options forfeited, number of shares (in shares) |  |  | 0 |  | 2.92
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) | 2.92 |  | 2.92 |  | 2.92
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 |  |  | $ (17,793) |  | $ 0
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share) |  |  | 1,720,623 | $ 2,165,509 | 2,165,509
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 |  | (444,886)
Nonvested, weighted average grant date fair value, end of period (in dollars per share) | $ 1,702,830 |  | $ 1,702,830 |  | $ 1,720,623
Unrecognized Compensation Costs Related To R S U Awards |  |  | $ 10 |  |
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 |  | 1,147,086 |  | 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 |  | $ 1.25

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited 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)(1)(iv)(3) -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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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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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