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Leases - Balance Sheet Classification and Other Information (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Balance Sheet Classification [Abstract] |  |
Long-term lease liabilities | $ 3,635 | $ 3,927
Total operating lease liabilities | $ 6,728 |
Other Information [Abstract] |  |
Weighted-average remaining term for operating leases | 4 years 3 months 21 days |
Weighted-average discount rate for operating leases | 8.22% |
Accounts Payable and Accrued Liabilities [Member] |  |
Balance Sheet Classification [Abstract] |  |
Current lease liabilities (recorded in Accrued expenses and other current liabilities) | $ 3,093 |

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