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RELATED-PARTY TRANSACTIONS - Additional Information (Details) - Special Committee Investigation Indemnification - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Current Directors        
Related Party Transaction [Line Items]        
Expenses from transactions with related parties $ 244 $ 120 $ 400 $ 120
Executive Officers and Directors        
Related Party Transaction [Line Items]        
Expenses from transactions with related parties $ 513 $ 465 $ 1,200 $ 687