Annual report pursuant to Section 13 and 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
Dec. 31, 2021
Dec. 31, 2020
Accounts Payable and Accrued Expenses    
Accounts payable $ 3,512 $ 3,518
Research and development 3,083 2,862
Accrued compensation 2,595 2,009
Other 554 358
Total accounts payable and accrued expenses $ 9,744 $ 8,747