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
Jun. 30, 2020
Dec. 31, 2019
Accounts Payable and Accrued Expenses    
Accounts payable $ 4,827 $ 1,877
Research and development 2,256 1,496
Accrued compensation 1,428 1,760
Other 485 535
Total accounts payable and accrued expenses $ 8,996 $ 5,668