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LEASES - Operating Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease cost $ 333 $ 171 $ 807 $ 490
Short-term lease cost 25 18 77 61
Total lease cost $ 358 $ 189 $ 884 $ 551