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CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - Warrants Issued and Outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2016
Class of Warrant or Right    
Warrants issued (shares) 430,080 430,080
Warrants outstanding (shares) 430,080  
Fair value of warrants outstanding $ 89  
September 2013    
Class of Warrant or Right    
Warrants issued (shares) 150,000  
Warrants outstanding (shares) 150,000  
Fair value of warrants outstanding $ 10  
October 2013    
Class of Warrant or Right    
Warrants issued (shares) 150,000  
Warrants outstanding (shares) 150,000  
Fair value of warrants outstanding $ 10  
December 2016    
Class of Warrant or Right    
Warrants issued (shares) 130,080  
Warrants outstanding (shares) 130,080  
Fair value of warrants outstanding $ 69