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STOCKHOLDERS' EQUITY - Preferred stock summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
May 16, 2019
Dec. 31, 2018
Dec. 31, 2017
Preferred Stock        
Preferred Stock Authorized     10,883,950  
Preferred Stock Issued     7,095,746  
Preferred Stock Outstanding   0 7,095,746  
Carrying Value     $ 35,410  
Liquidation Value     $ 36,964  
Common Stock Issuable Upon Conversion     7,095,746  
Series A Convertible Preferred Stock        
Preferred Stock        
Preferred Stock Authorized 0   3,093,898  
Preferred Stock Issued 0   3,093,898  
Preferred Stock Outstanding 0   3,093,898 3,093,898
Carrying Value     $ 6,254 $ 6,254
Liquidation Value $ 0   $ 7,000  
Common Stock Issuable Upon Conversion     3,093,898  
Series B Convertible Preferred Stock        
Preferred Stock        
Preferred Stock Authorized 0   7,790,052  
Preferred Stock Issued 0   4,001,848  
Preferred Stock Outstanding 0   4,001,848  
Carrying Value     $ 29,156  
Liquidation Value $ 0   $ 29,964  
Common Stock Issuable Upon Conversion     4,001,848