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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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