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Related Party Transactions - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Directors        
Related Party Transaction [Line Items]        
Consulting fees paid $ 0 $ 0 $ 0 $ 5