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CONVERTIBLE NOTES - Bridge Notes (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 26, 2020
Mar. 25, 2020
Dec. 31, 2020
Dec. 31, 2021
Debt Instrument [Line Items]        
Loss on extinguishment of convertible notes     $ (1,225)  
Convertible notes     0 $ 0
April 2019 Bridge Notes And May 2019 Bridge Notes        
Debt Instrument [Line Items]        
Guaranteed interest period 18 months 12 months    
April 2019 Bridge Notes And May 2019 Bridge Notes | Convertible Debt [Member] | Amendment Agreement        
Debt Instrument [Line Items]        
Floor price $ 0.40 $ 2.25    
Debt premium on debt     800  
Loss on extinguishment of convertible notes     1,200  
Convertible Bridge Loan | Convertible Debt [Member]        
Debt Instrument [Line Items]        
Warrant liability canceled due to settlement of equity instruments     $ 2,200  
Number of shares converted from debt instrument (in shares)     3,908,145