Quarterly report pursuant to Section 13 or 15(d)

Accounts Payable and Accrued Expenses (Details)

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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accounts Payable and Accrued Expenses    
Accounts payable $ 3,728 $ 9,750
Accrued compensation 293 439
Research and development 2,601 1,751
Other 285 377
Accounts payable and accrued expenses - related party 904 776
Total accounts payable and accrued expenses $ 7,811 $ 13,093