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, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Shares      
Outstanding beginning balance (in shares) 4,300,088    
Granted (in shares) 0 0 0
Exercised (in shares) 0    
Forfeited (in shares) (76,398)    
Expired (in shares) (23,349)    
Outstanding ending balance (in shares) 4,200,341 4,300,088  
Exercisable ending balance (in shares) 4,098,924    
Weighted Average Exercise Price      
Outstanding beginning balance (in dollars per share) $ 5.03    
Granted (in dollars per share) 0    
Exercised (in dollars per share) 0    
Forfeited (in dollars per share) 14.00    
Expired (in dollars per share) 14.00    
Outstanding ending balance (in dollars per share) 4.82 $ 5.03  
Exercisable ending balance (in dollars per share) $ 4.59