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STOCKHOLDERS' EQUITY (Common Stock, 2018 Purchase Agreement and LP Purchase Agreement) (Details) - USD ($)
 3 Months Ended
Jun. 26, 2020
Apr. 08, 2020
Mar. 26, 2020
Sep. 07, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Jan. 01, 2019
Dec. 20, 2018
Class of Stock [Line Items]                  
Common stock, shares authorized (in shares)         150,000,000   150,000,000 250,000,000 150,000,000
Shares issued (in shares)         18,132,063   17,576,916    
Common stock, shares outstanding (in shares)         18,132,063   17,576,916    
Issuance of common stock, net of issuance costs         $ 1,260,000 $ 1,350,000      
Issuance of common stock for consulting services         $ 150,000        
Conversion of debt into stock           $ 353,000      
Common Stock [Member]                  
Class of Stock [Line Items]                  
Common stock issued in connection with the conversion of convertible notes         0 427,997      
Issuance of common stock for consulting services (in shares)         55,147        
Issuance of common stock for consulting services         $ 200,000        
Number of shares converted from debt instrument (in shares)           427,997      
Conversion of debt into stock         $ 0 $ 400,000      
Lincoln Park [Member]                  
Class of Stock [Line Items]                  
Value of shares issued     $ 10,000,000 $ 10,000,000          
New shares issued (in shares) 4,500,000                
Shares issued (in shares)         3,460,000        
Shares sold in offering (in shares)     4,980,000     930,012      
Issuance of common stock, net of issuance costs           $ 1,300,000      
LP 2020 Purchase Agreement [Member]                  
Class of Stock [Line Items]                  
Issuance of common stock, net of issuance costs         $ 8,800,000        
LP 2020 Purchase Agreement [Member] | Lincoln Park [Member]                  
Class of Stock [Line Items]                  
Value of shares issued     $ 10,000,000            
New shares issued (in shares)   1,770,000 250,000            
Shares sold in offering (in shares)         500,000        
Issuance of common stock, net of issuance costs         $ 1,300,000