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STOCKHOLDERS' EQUITY - Shares Issued through the At-the-Market Offering Program (Details) - At-the-Market Equity Offering Program - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
STOCKHOLDERS' EQUITY |  |  |  |
Number of shares sold | 0 | 49,000 | 17,000 | 49,000
Proceeds from sale of common stock, net of commissions |  | $ 1,489,000 | $ 604,000 | $ 1,489,000
Payment of commissions on sale of shares |  | 30,000 | 12,000 | 30,000
Payment of offering costs on sale of shares |  | $ 65,000 | $ 41,000 | $ 65,000

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