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COMMITMENTS AND CONTINGENCIES - Lease Expense Components (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]        
Operating lease costs $ 1,684 $ 1,274 $ 5,130 $ 3,776