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MERGER RELATED EXPENSES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Business Acquisition [Line Items]        
Transaction costs     $ 27,300  
Bridge shareholders        
Business Acquisition [Line Items]        
Costs associated with employee severance and other merger-related compensation expense $ 1,100 $ 1,400 $ 15,000  
Merger expenses   0   $ 0
Transaction costs   $ 769   $ 2,400