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COMMITMENTS AND CONTINGENCIES - SCHEDULE OF COMPONENTS OF LEASE EXPENSE, OTHER INFORMATION AND CASH FLOWS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Lease, Cost [Abstract]            
Fixed operating lease costs $ 5,011 $ 2,693 $ 8,790 $ 5,063 $ 11,420 $ 5,422
Variable operating lease costs 1,374 704 2,452 1,427 3,009 1,078
Short-term lease costs 356 307 610 313 1,222 1,188
Total lease costs $ 6,741 $ 3,704 $ 11,852 6,803 $ 15,651 $ 7,688
Weighted Average Remaining Lease Term and Discount Rate [Abstract]            
Weighted-average remaining lease term 5 years 2 months 23 days   5 years 2 months 23 days   5 years 4 months 28 days 5 years 1 month 9 days
Weighted-average discount rate 6.21%   6.21%   7.02% 7.47%
Operating cash flows:            
Payments for operating lease liabilities     $ 1,070 9,609 $ 12,781 $ 4,755
Supplemental cash flow data:            
Lease liabilities arising from obtaining right-of-use assets     $ 31,693 $ 14,902 $ 25,958 $ 14,816