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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
STOCKHOLDERS' EQUITY        
Number of shares sold 0 17,000 0 17,000
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