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STOCK-BASED COMPENSATION, Restricted Stock and Stock-Based Compensation Expense (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
General and Administrative Expense [Member] |  |  |
Stock-based Compensation [Abstract] |  |  |
Stock based compensation expense | $ 800,000 | $ 17,000 |
Research and Development Expense [Member] |  |  |
Stock-based Compensation [Abstract] |  |  |
Stock based compensation expense | $ 400,000 | $ 400,000 |
Restricted Common Units [Member] |  |  |
Stock-based Compensation [Abstract] |  |  |
Restricted stock replaced during the period (in shares) | 3,000 |  |
Unvested restricted common stock forfeited (in shares) | 9,000 |  |
Unvested restricted stock outstanding (in shares) | 1,323,000 | 0 | 240,000
Restricted Common Shares [Member] |  |  |
Stock-based Compensation [Abstract] |  |  |
Restricted stock replaced during the period (in shares) | 630,000 |  |
Stock based compensation expense |  | $ 300,000 |
Unvested restricted common stock forfeited (in shares) | 78,000 |  |
Unvested restricted stock outstanding (in shares) | 0 |  |

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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 Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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