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SUBSEQUENT EVENTS, Private Placement Offerings (Details) - USD ($)
May 14, 2021
Apr. 26, 2021
Mar. 31, 2021
Dec. 31, 2020
Private Placement Offerings [Abstract]        
Number of shares authorized to sale in regular purchase (in shares)     100,000,000 100,000,000
Purchase Agreement [Member] | Maximum [Member] | Subsequent Event [Member]        
Private Placement Offerings [Abstract]        
Proceeds from sale of common stock   $ 20,000,000    
Purchase Agreement [Member] | Lincoln Park [Member] | Subsequent Event [Member]        
Private Placement Offerings [Abstract]        
Common stock, shares issued in consideration for purchase commitment (in shares)   56,041    
Common stock issued and sold during period (in shares) 302,358      
Gross proceeds $ 6,300,000      
Purchase Agreement [Member] | Lincoln Park [Member] | Maximum [Member] | Subsequent Event [Member]        
Private Placement Offerings [Abstract]        
Proceeds from sale of common stock   $ 20,000,000    
Number of shares authorized to sale in regular purchase (in shares)   60,000    
Maximum commitment in any single regular purchase   $ 1,000,000    
Beneficial ownership percentage on total outstanding shares that prohibits company to direct share purchases   4.99%    
Purchase Agreement [Member] | Lincoln Park [Member] | Minimum Closing Price 5.50 [Member] | Maximum [Member] | Subsequent Event [Member]        
Private Placement Offerings [Abstract]        
Number of shares authorized to sale in regular purchase (in shares)   80,000    
Purchase Agreement [Member] | Lincoln Park [Member] | Minimum Closing Price 7.00 [Member] | Maximum [Member] | Subsequent Event [Member]        
Private Placement Offerings [Abstract]        
Number of shares authorized to sale in regular purchase (in shares)   120,000