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MERGER AND OTHER COSTS - Details of Merger and Other Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Merger Related Costs [Abstract]        
Investor fee paid in common stock (Note 9) shares $ 17,826   $ 17,826  
Advisor fee paid in warrants (Note 9) 8,779   8,779  
Professional and other fees 1,140   1,434  
Total Merger related costs 27,745   28,039  
Public company filing related costs 2,102   3,056  
Total Merger and other costs $ 29,847 $ 0 $ 31,095 $ 0