Annual report pursuant to Section 13 and 15(d)

STOCK???BASED COMPENSATION - Summary of Stock Option Activity (Details)

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STOCK‑BASED COMPENSATION - Summary of Stock Option Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Shares      
Outstanding beginning balance (in shares) 4,200,000    
Granted (in shares) 0 0 0
Exercised (in shares) (3,326,000)    
Forfeited (in shares) 0    
Expired (in shares) (76,000)    
Outstanding ending balance (in shares) 798,000 4,200,000  
Exercisable ending balance (in shares) 798,000    
Weighted Average Exercise Price      
Outstanding beginning balance (in dollars per share) $ 4.82    
Granted (in dollars per share) 0    
Exercised (in dollars per share) 3.42    
Forfeited (in dollars per share) 0.00    
Expired (in dollars per share) 14.00    
Outstanding ending balance (in dollars per share) 9.77 $ 4.82  
Exercisable ending balance (in dollars per share) $ 9.77