Accounts Payable and Accrued Expenses (Schedule of Accounts Payable and Accrued Expenses) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accounts Payable and Accrued Expenses
Accounts payable	$ 6,322	$ 6,833
Accrued research and development	4,118	2,782
Accrued compensation	2,838	3,468
Other	739	648
Total accounts payable and accrued expenses	$ 14,017	$ 13,731