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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

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