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SHAREHOLDERS' EQUITY - Deferred Compensation Arrangement - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
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) | 1,960 | 2,456
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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