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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
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Mar. 31, 2022 | Mar. 31, 2021
STOCKHOLDERS' EQUITY |  |
Number of shares sold | 17,259 | 0
Proceeds from sale of common stock, net of commissions | $ 604,000 |
Payment of commissions on sale of shares | 12,000 |
Payment of offering costs on sale of shares | $ 41,000 |

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