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STOCKHOLDERS' EQUITY (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Aug. 14, 2020
USD ($)
shares
May 19, 2020
shares
Apr. 01, 2020
USD ($)
shares
Jun. 26, 2019
shares
Jan. 17, 2018
USD ($)
shares
Dec. 29, 2017
USD ($)
shares
Nov. 08, 2017
USD ($)
$ / shares
shares
Jul. 31, 2019
shares
Dec. 31, 2020
USD ($)
vote
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Jun. 30, 2019
shares
Dec. 31, 2017
shares
Class of Stock [Line Items]                            
Preferred stock, votes per share (in vote) | vote                 1          
Dividend rate (usd per share) | $ / shares                 $ 0.16          
Cash paid for preferred stock dividends declared (in usd per share) | $ / shares                 $ 0.16 $ 0.16        
Sale of Stock, Number of Shares Issued in Transaction 2,415,000                          
Proceeds from Issuance or Sale of Equity | $ $ 192,700                          
Proceeds from sale of common stock included in accounts receivable | $                 $ 0 $ 2,848 $ 0      
Deferred Offering Costs | $                 $ 11,400          
Noncumulative Dividend Percentage1                 10.00%          
Temporary Equity, Liquidation Preference Per Share | $ / shares                 $ 0.10          
Proceeds From Issuance Security Token Offering, Net Of Withdrawals | $                       $ 104,800    
Withdrawal Under Security Token Offering | $                       22,000    
Capitalized Offering Costs for Security Token Offering | $                     21,500 $ 21,500    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights         1,250,000 2,472,188 3,722,188              
Proceeds from Warrant Exercises | $         $ 50,600 $ 100,000                
Proceeds from Issuance of Warrants | $             $ 6,500   $ 0 $ 0 $ 50,588      
Stock And Warrants Issued During Period, Warrants, Price Per Warrant | $ / shares             $ 40.45              
Series A-1                            
Class of Stock [Line Items]                            
Shares issued upon conversion (in shares)                 1          
Preferred stock, shares outstanding                 4,204,000 4,210,000        
Preferred Stock, Shares, Dividends Declared                   4,085,445        
Preferred Stock Dividends, Shares   4,079,030                        
Preferred Stock, Shares, Dividends Declared                   4,085,445        
Preferred Stock Dividends, Shares   4,079,030                        
At-The-Market Agreement [Member] | JonesTrading Institutional Services LLC [Member]                            
Class of Stock [Line Items]                            
Sale of Stock, Number of Shares Issued in Transaction                 415,904 7,590,498        
Proceeds from Issuance or Sale of Equity | $                   $ 85,800        
Deferred Offering Costs | $                   $ 2,000        
tZero.com, Inc.                            
Class of Stock [Line Items]                            
Sale of Stock, Number of Shares Issued in Transaction     508,710                      
Sale Of Stock, Number of Shares Issued In Transaction As A Percentage Of Total Shares Issued And Outstanding     0.50%                      
Sale Of Stock, Total Consideration Received On Transaction | $     $ 5,000                      
Preferred Stock [Member] | Series A                            
Class of Stock [Line Items]                            
Partners' Capital Account, Units, Converted                 0 2,000 0      
Preferred stock, shares outstanding                 0 0 127,000 127,000 2,895 127,000
Preferred Stock [Member] | Series A-1                            
Class of Stock [Line Items]                            
Partners' Capital Account, Units, Converted       122,526         0 125,000 0      
Preferred stock, shares outstanding                 4,204,000 4,210,000 0 0   0
Preferred Stock, Shares, Dividends Declared                 0 4,085,000 0      
Preferred Stock, Shares, Dividends Declared                 0 4,085,000 0      
Preferred Stock [Member] | Series A Preferred Stock Exchange [Member] | Series A                            
Class of Stock [Line Items]                            
Partners' Capital Account, Units, Converted       122,526       2,020            
Preferred Stock [Member] | Series A Preferred Stock Conversion [Member] | Series A                            
Class of Stock [Line Items]                            
Partners' Capital Account, Units, Converted       1,144       875