Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - Summary of Restricted Stock Transactions (Details)

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SHARE-BASED COMPENSATION - Summary of Restricted Stock Transactions (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares      
Unvested, beginning balance (in shares) 24,625    
Granted (in shares) 20,061    
Vested (in shares) (9,197)    
Forfeited (in shares) (528)    
Unvested, ending balance (in shares) 34,961 24,625  
Weighted-Average Grant Date Fair Value      
Unvested, beginning balance (in dollars per share) $ 7.56    
Granted (in dollars per share) 1.17 $ 8.53 $ 11.02
Vested (in dollars per share) 1.27    
Forfeited (in dollars per share) 7.72    
Unvested, ending balance (in dollars per share) $ 5.78 $ 7.56