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, 2020
Dec. 31, 2019
Accounts Payable and Accrued Expenses    
Accounts payable $ 3,518 $ 1,877
Research and development 2,862 1,760
Accrued compensation 2,009 1,496
Other 358 535
Total accounts payable and accrued expenses $ 8,747 $ 5,668