General form of registration statement for all companies including face-amount certificate companies

FAIR VALUE MEASUREMENTS (Schedule of Warrants Follows at Initial Measurement) (Details)

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FAIR VALUE MEASUREMENTS (Schedule of Warrants Follows at Initial Measurement) (Details) - USD ($)
 1 Months Ended 9 Months Ended 12 Months Ended
Feb. 16, 2021
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Expected term (years)     6 years 1 month 9 days 6 years 1 month 9 days
Expected volatility     79.00% 70.00%
ION Acquisition Corp 2 LTD        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Fair value of Class A ordinary share (in dollars per share) $ 9.79 $ 9.91    
ION Acquisition Corp 2 LTD | Public Warrants        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Risk-free interest rate 0.73%      
Expected term (years) 5 years 10 months 13 days      
Expected volatility 23.20%      
Exercise price $ 11.50      
Fair value of Unit $ 10      
ION Acquisition Corp 2 LTD | Private Placement        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Risk-free interest rate 0.73% 1.01%    
Expected term (years) 5 years 10 months 13 days 5 years 2 months 12 days    
Expected volatility 42.60% 46.30%    
Exercise price $ 11.50 $ 11.50    
Fair value of Unit $ 10 $ 10.05