Annual report pursuant to Section 13 and 15(d)

Accounts Payable and Accrued Expenses (Details)

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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts payable $ 9,750 $ 3,645
Accrued compensation 439 405
Research and development 1,751 1,466
Other 377 246
Accounts payable and accrued expenses - related party 776 610
Total accounts payable and accrued expenses $ 13,093 $ 6,372