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MERGER - Merger Narrative (Details) - USD ($)
Jun. 01, 2021
Sep. 30, 2021
Mar. 31, 2021
Nov. 27, 2020
Business Combination, Separately Recognized Transactions [Line Items]        
Common stock, par value (USD per share) $ 0.0001 $ 0.0001 $ 0.0001  
Reverse recapitalization, options converted (in shares) 29,257,576      
Reverse recapitalization, warrants converted (in shares) 1,897,212      
PIPE issuance (in shares) 20,000,000      
Sale of stock (USD per share) $ 10.00      
PIPE issuance consideration $ 200,000,000.0      
Exercise price of warrants (USD per share) $ 11.50      
Common stock, shares authorized (in shares) 500,000,000 500,000,000    
Common Class B        
Business Combination, Separately Recognized Transactions [Line Items]        
Net equity infusion from the Merger (in shares) 6,358,750      
2025 Convertible Notes | Convertible Debt        
Business Combination, Separately Recognized Transactions [Line Items]        
Debt interest rate       5.50%
Debt instrument, convertible, number of equity instruments (in shares) 7,713,121