Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - (Details)

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STOCKHOLDERS' EQUITY - (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 09, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Increase (Decrease) in Stockholders' Equity            
Balance   $ 4,382 $ 20,618 $ 7,365 $ 1,752 $ 1,752
Stock-based compensation   1,141 665 1,775 2,059  
Fair value of warrants issued to consultants for services   3 71 6 73  
Issuance of Units for cash   41,000   41,000    
Issuance of Units for cash (In shares) 2,500,000          
Advisory fees and other offering costs   (3,550)   (3,550) (1,500)  
Issuance of common stock for services   7   7    
Net loss   (7,097) (6,666) (10,717) (11,746) 20,300
Balance   35,886 14,688 35,886 14,688 7,365
Common Stock            
Increase (Decrease) in Stockholders' Equity            
Balance   $ 6 $ 6 $ 6 $ 4 $ 4
Balance (in shares)   5,867 5,867 5,867 4,208 4,208
Issuance of Units for cash   $ 2   $ 2    
Issuance of Units for cash (In shares)   2,485   2,485    
Balance   $ 8 $ 6 $ 8 $ 6 $ 6
Balance (in shares)   8,352 5,867 8,352 5,867 5,867
Additional Paid-in Capital            
Increase (Decrease) in Stockholders' Equity            
Balance   $ 155,232 $ 152,595 $ 154,595 $ 128,651 $ 128,651
Stock-based compensation   1,141 665 1,775 2,059  
Fair value of warrants issued to consultants for services   3 71 6 73  
Issuance of Units for cash   40,998   40,998    
Advisory fees and other offering costs   (3,550)   (3,550) (1,500)  
Issuance of common stock for services   7   7    
Net loss   0 0 0 0  
Balance   193,831 153,331 193,831 153,331 154,595
Accumulated Deficit            
Increase (Decrease) in Stockholders' Equity            
Balance   (150,856) (131,983) (147,236) (126,903) (126,903)
Stock-based compensation   0 0 0 0  
Fair value of warrants issued to consultants for services   0 0 0 0  
Issuance of Units for cash   0   0    
Advisory fees and other offering costs   0   0 0  
Issuance of common stock for services   0   0    
Net loss   (7,097) (6,666) (10,717) (11,746)  
Balance   $ (157,953) $ (138,649) $ (157,953) $ (138,649) $ (147,236)