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STOCKHOLDERS' EQUITY - Unvested awards (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Unvested restricted stock  
Unrecognized compensation cost $ 66,962
Expected weighted-average period in years of compensation cost to be recognized 1 year
Stock options  
Unrecognized compensation cost $ 523
Expected weighted-average period in years of compensation cost to be recognized 1 year