Quarterly report pursuant to Section 13 or 15(d)

Accounts Payable and Accrued Expenses (Schedule of Accounts Payable and Accrued Expenses) (Details)

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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