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STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Jan. 31, 2020
Subsidiary, Sale of Stock [Line Items]        
Reduction to additional paid-in capital, due to offering costs incurred $ 1,900      
Net proceeds from issuance of warrants   $ 0 $ 29  
Registration Statement        
Subsidiary, Sale of Stock [Line Items]        
Warrant right to purchase a share of common stock (in shares)       0.25
Premium of the exercise price of the warrant as a percent to net asset value of common stock       15.00%
Rights Offering        
Subsidiary, Sale of Stock [Line Items]        
Sale of stock, number of shares issued 8,521,589      
Purchase price (in usd per share) $ 9.25 $ 9.25    
Consideration received on transaction $ 78,800      
Series A Preferred Unit        
Subsidiary, Sale of Stock [Line Items]        
Number of securities called by warrants or rights (in shares) 1,194,159 1,194,159    
Net proceeds from issuance of warrants   $ 614    
Series A Preferred Warrants        
Subsidiary, Sale of Stock [Line Items]        
Warrants issued (in shares) 4,603,287 4,603,287