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Right-of-Use Asset and Lease Liabilities - Supplemental Balance Sheet Lease Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Assets:    
Operating lease assets $ 15,612 $ 19,491
Finance lease assets 408 464
Total leased assets 16,020 19,955
Current    
Operating 6,015 5,515
Finance 190 183
Non-current    
Long-term lease obligations 12,525 17,202
Long-term lease obligations 224 282
Total lease obligations $ 18,954 $ 23,182
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued expenses and other current liabilities Accrued expenses and other current liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other liabilities Other liabilities
Accumulated amortization $ 13,298 $ 9,083
Accumulated depreciation of assets under finance leases $ 187 $ 28