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STOCK-BASED COMPENSATION - Schedule of Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs)
shares in Thousands
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Dec. 31, 2020
shares
Share units    
Beginning balance (in shares) | shares 595 34
Granted (in shares) | shares 561  
Vested (in shares) | shares 0  
Forfeited (in shares) | shares 0  
Ending balance (in shares) | shares 595  
Weighted- average grant date fair value per share    
Beginning balance (in usd per share) | $ / shares $ 38.08  
Granted (in usd per share) | $ / shares 52.58  
Vested (in usd per share) | $ / shares 0  
Forfeited (in shares) | $ / shares 0  
Ending balance (in usd per share) | $ / shares $ 51.76