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STOCKHOLDERS' EQUITY (Common Stock, 2018 Purchase Agreement and LP Purchase Agreement) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 20, 2018
Dec. 19, 2018
Class of Stock [Line Items]              
Common stock, shares authorized (in shares) 150,000,000   150,000,000   150,000,000 250,000,000 150,000,000
Issuance of common stock in connection with at the market offering, net of issuance costs $ 47,000   $ 485,000        
Shares issued (in shares) 27,562,298   27,562,298   22,820,260    
Common stock, shares outstanding (in shares) 27,562,298   27,562,298   22,820,260    
Issuance of common stock, net of issuance costs     $ 2,245,000        
Common Stock [Member]              
Class of Stock [Line Items]              
Proceeds upon issuance of common stock from exercise of warrants (in shares)       266      
Issuance of common stock in connection with at the market offering, net of issuance costs $ 1,000   $ 6,000        
Shares issued (in shares) 73,212   617,038        
Common Stock [Member]              
Class of Stock [Line Items]              
Proceeds upon issuance of common stock from exercise of warrants (in shares) 0 0 0 266      
Warrant exercises in period 0 0 0 266      
Proceeds from exercise of warrants     $ 0        
Preferred Class B              
Class of Stock [Line Items]              
Conversion price (in dollars per share) $ 0.40   $ 0.40        
Maximum [Member] | Common Stock [Member]              
Class of Stock [Line Items]              
Proceeds from exercise of warrants       $ 1,000