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STOCKHOLDERS' EQUITY - Preferred Stock (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
vote
$ / shares
shares
Dec. 31, 2021
$ / shares
shares
Dec. 31, 2020
$ / shares
Mar. 31, 2021
shares
Class of Stock [Line Items]        
Preferred Stock, Number of Votes | vote 1      
Preferred Stock, Dividend Rate, Per-Dollar-Amount | $ / shares $ 0.16      
Dividend paid (in usd per share) | $ / shares   $ 0.16 $ 0.16  
Series A-1 Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, shares outstanding 4,198,000 4,204,000    
Number of convertible preferred shares upon conversion (in shares) 1      
Preferred stock | Series A-1 Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, shares outstanding 4,198,000     4,204,000