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Right-of-Use Asset and Lease Liabilities - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease cost $ 1,699 $ 1,461 $ 5,002 $ 4,383
Depreciation of assets 60 0 165 0
Interest on lease liabilities 5 0 14 0
Sublease income (96) (96) (288) (288)
Total net lease cost $ 1,668 $ 1,365 $ 4,893 $ 4,095