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Leases - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Jan. 01, 2020
Assets and Liabilities, Lessee [Abstract]      
Right-of-use assets $ 8,024 $ 8,668 $ 9,500
Operating Lease, Liability [Abstract]      
Short-term lease liabilities $ 1,231 $ 1,231  
Operating Lease, Liability, Current, Statement of Financial Position Accrued expenses and other current liabilities Accrued expenses and other current liabilities  
Long-term lease liabilities $ 7,647 $ 8,318