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LEASES - Summary of operating lease cost and other operating lease information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Lease, Cost [Abstract]        
Fixed lease costs $ 2,919 $ 3,099 $ 8,762 $ 7,085
Variable lease costs 416 611 1,318 1,661
Total $ 3,335 $ 3,710 10,080 8,746
Cash Flow, Operating Activities, Lessee [Abstract]        
Cash paid for operating lease liabilities, net of lease incentive     9,868 11,251
Right-of-use assets recorded in exchange for lease obligations     $ 212 $ 42,101
Weighted average remaining lease term 8 years 5 months 15 days 9 years 4 months 20 days 8 years 5 months 15 days 9 years 4 months 20 days
Weighted average discount rate 6.88% 6.88% 6.88% 6.88%