Annual report pursuant to Section 13 and 15(d)

SUBSEQUENT EVENTS (Details)

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SUBSEQUENT EVENTS (Details) - USD ($)
$ in Thousands, shares in Millions
2 Months Ended 12 Months Ended
Mar. 23, 2020
Feb. 24, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 09, 2021
Subsequent Event [Line Items]            
Fees and commissions on sale of stock     $ 3,989 $ 0 $ 4,090  
Proceeds from warrant exercise     $ 1,000 $ 0 $ 0  
2019 Term Loan | Loans Payable            
Subsequent Event [Line Items]            
Repayments of debt principal $ 19,100          
At-the-market program            
Subsequent Event [Line Items]            
Number of shares issued in transaction (in shares)     43.7      
Net proceeds from sale of stock     $ 53,800      
Sale of stock, remaining capacity for sale amount     $ 333,800      
Subsequent Event | 2018 Term Loan | Loans Payable            
Subsequent Event [Line Items]            
Repayments of debt principal   $ 43,000        
Subsequent Event | Replacement and Third Amendment Warrants | 2019 Term Loan            
Subsequent Event [Line Items]            
Repayments of debt principal   $ 5,600        
Number of shares for purchase under warrant (in shares)   6.0        
Proceeds from warrant exercise   $ 8,200        
Subsequent Event | At-the-market program            
Subsequent Event [Line Items]            
Number of shares issued in transaction (in shares)   25.6        
Net proceeds from sale of stock   $ 57,200        
Fees and commissions on sale of stock   $ 1,800        
Sale of stock, remaining capacity for sale amount           $ 274,900