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STOCKHOLDERS' EQUITY (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Aug. 14, 2020
USD ($)
shares
May 19, 2020
shares
Jun. 26, 2019
shares
Jul. 31, 2019
shares
Dec. 31, 2021
USD ($)
vote
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Aug. 17, 2021
USD ($)
Jun. 30, 2019
shares
Dec. 31, 2018
shares
Class of Stock [Line Items]                    
Dividend rate (usd per share) | $ / shares         $ 0.16          
Cash paid for preferred stock dividends declared (in usd per share) | $ / shares         $ 0.16 $ 0.16 $ 0.16      
Sale of Stock, Number of Shares Issued in Transaction 2,415,000                  
Proceeds from Issuance or Sale of Equity | $ $ 192,700                  
Proceeds from sale of common stock included in accounts receivable | $         $ 0 $ 0 $ 2,848      
Deferred Offering Costs | $ $ 11,400                  
Preferred stock, votes per share (in vote) | vote         1          
Stock Repurchase Program, Authorized Amount | $               $ 100,000    
Series A-1                    
Class of Stock [Line Items]                    
Shares issued upon conversion (in shares)         1          
Preferred stock, shares outstanding         4,204,000 4,204,000        
Preferred Stock, Shares, Dividends Declared             4,085,445      
Preferred Stock Dividends, Shares   4,079,030                
Preferred Stock, Shares, Dividends Declared             4,085,445      
Preferred Stock Dividends, Shares   4,079,030                
At-The-Market Agreement [Member] | JonesTrading Institutional Services LLC [Member]                    
Class of Stock [Line Items]                    
Sale of Stock, Number of Shares Issued in Transaction           415,904 7,590,498      
Proceeds from Issuance or Sale of Equity | $             $ 85,800      
Deferred Offering Costs | $             $ 2,000      
Preferred Stock [Member] | Series A                    
Class of Stock [Line Items]                    
Partners' Capital Account, Units, Converted         0 0 2,000      
Preferred stock, shares outstanding         0 0 0   2,895 127,000
Preferred Stock [Member] | Series A-1                    
Class of Stock [Line Items]                    
Partners' Capital Account, Units, Converted     122,526   0 0 125,000      
Preferred stock, shares outstanding         4,204,000 4,204,000 4,210,000     0
Preferred Stock, Shares, Dividends Declared         0 0 4,085,000      
Preferred Stock, Shares, Dividends Declared         0 0 4,085,000      
Preferred Stock [Member] | Series A Preferred Stock Exchange [Member] | Series A                    
Class of Stock [Line Items]                    
Partners' Capital Account, Units, Converted     122,526 2,020            
Preferred Stock [Member] | Series A Preferred Stock Conversion [Member] | Series A                    
Class of Stock [Line Items]                    
Partners' Capital Account, Units, Converted     1,144 875