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Accounts Payable and Accrued Expenses (Schedule of Accounts Payable and Accrued Expenses) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Accounts Payable and Accrued Expenses |  |
Accounts payable | $ 5,498 | $ 6,833
Research and development | 3,671 | 2,782
Accrued compensation | 2,641 | 3,468
Other | 898 | 648
Total accounts payable and accrued expenses | $ 12,708 | $ 13,731

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