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SHAREHOLDERS' EQUITY - Deferred Compensation Arrangement - Additional Information (Details) - USD ($) | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Non-Employee Members of Scientific Advisory Board [Member] |  |
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items] |  |
Shares issued (in shares) | 1,400 | 1,926
Members of Scientific Advisory Board [Member] |  |
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items] |  |
Fair value of shares issued | $ 300,000 | $ 300,000

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- Definition The total fair value of shares issued during the period under a deferred compensation 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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