Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED COMPENSATION - Restricted Stock Awards (Details)

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STOCK BASED COMPENSATION - Restricted Stock Awards (Details) - $ / shares
shares in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Weighted Average Grant Date Fair Value    
Weighted-average remaining contractual term (in years) 7 years 3 months 25 days 7 years 9 months
Restricted Stock awards    
Shares Subject to Vesting    
Balance at beginning of period, unvested shares (in shares) 280  
Issuance of additional shares (in shares) 476  
Vested (in shares) (408)  
Balance at end of period, unvested shares (in shares) 348 280
Weighted Average Grant Date Fair Value    
Balance at beginning of Period, unvested shares (in dollars per share) $ 4.08  
Issuance of additional shares (in dollars per share) 8.78  
Vested (in dollars per share) 6.84  
Balance at end of Period, unvested shares (in dollars per share) $ 7.27 $ 4.08
Weighted-average remaining contractual term (in years) 1 year 9 months 18 days