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SHARE-BASED COMPENSATION - Stock Option Activity (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Stock Option Awards    
Beginning balance (in shares) 5,621,364  
Granted (in shares) 566,621  
Exercised (in shares) 0  
Forfeited (in shares) 0  
Ending balance (in shares) 6,187,985 5,621,364
Vested or expect to vest (in shares) 6,187,985  
Vested or expect to vest (in shares) 2,107,986  
Weighted Average Exercise Price    
Beginning balance (in usd per share) $ 7.94  
Granted (in usd per share) 13.50  
Exercised (in usd per share)  
Forfeited (in usd per share)  
Ending balance (in usd per share) 7.75 $ 7.94
Vested or expect to vest at end of period (in usd per share) 7.75  
Vested or expect to vest at end of period (in usd per share) $ 7.86  
Weighted Average Remaining Contractual Life (Years)    
Weighted Average Remaining Contractual Life (Years) 8 years 9 months 25 days 9 years 2 months 12 days
Granted, weighted average remaining contractual term   9 years 11 months 15 days
Weighted average remaining contractual life vested or expect to vest 8 years 9 months 25 days  
Weighted average remaining contractual life vested or expect to vest 8 years 8 months 12 days