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Accounts Payable and Accrued Expenses (Schedule of Accounts Payable and Accrued Expenses) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts Payable and Accrued Expenses |  |
Accounts payable | $ 4,629 | $ 3,518
Research and development | 2,801 | 2,862
Accrued compensation | 2,006 | 2,009
Other | 398 | 358
Total accounts payable and accrued expenses | $ 9,834 | $ 8,747

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