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SHARE-BASED COMPENSATION - Weighted-Average Inputs and Assumptions (Details) - $ / shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]    
Fair market value (in dollars per share) $ 3.40 $ 0.87
Grant exercise price (in dollars per share) $ 3.40 $ 0.87
Expected term (in years) 6 years 10 days 6 years 1 month 6 days
Risk-free interest rate 0.90% 1.30%
Expected volatility 74.60% 71.50%
Dividend yield 0.00% 0.00%