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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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