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STOCK BASED COMPENSATION - Summary of Stock Options Outstanding and Exercisable by Stock Option Plan (Details) - $ / shares | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding Stock Options, Number of Outstanding Stock Options | 277,576 | 185,054 | 161,897 | 37,786
Outstanding Stock Options, Weighted Average Exercise Price | $ 6.18 | $ 7.99 | $ 9.25 | $ 37.42
Exercisable Stock Options, Number of Exercisable Stock Options | 183,054 |  | 36,093 |
Exercisable Stock Options, Weighted Average Exercise Price | $ 7.35 |  | $ 34.41 |
2004 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding Stock Options, Number of Outstanding Stock Options | 92 |  |  |
Outstanding Stock Options, Weighted Average Exercise Price | $ 1,638.00 |  |  |
Exercisable Stock Options, Number of Exercisable Stock Options | 92 |  |  |
Exercisable Stock Options, Weighted Average Exercise Price | $ 1,638.00 |  |  |
2004 Directors Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding Stock Options, Number of Outstanding Stock Options | 3 |  |  |
Outstanding Stock Options, Weighted Average Exercise Price | $ 10,380.00 |  |  |
Exercisable Stock Options, Number of Exercisable Stock Options | 3 |  |  |
Exercisable Stock Options, Weighted Average Exercise Price | $ 10,380.00 |  |  |
2013 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding Stock Options, Number of Outstanding Stock Options | 277,481 |  |  |
Outstanding Stock Options, Weighted Average Exercise Price | $ 5.53 |  |  |
Exercisable Stock Options, Number of Exercisable Stock Options | 182,959 |  |  |
Exercisable Stock Options, Weighted Average Exercise Price | $ 6.36 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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