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Accounts Payable and Accrued Expenses (Schedule of Accounts Payable and Accrued Expenses) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounts Payable and Accrued Expenses
Accounts payable	$ 5,540	$ 3,512
Research and development	1,535	3,083
Accrued compensation	2,094	2,595
Other	446	554
Total accounts payable and accrued expenses	$ 9,615	$ 9,744

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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