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Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts Payable and Accrued Expenses [Abstract]
Bonus	$ 956	$ 703
Research and development	956	814
Severance and benefits	891	88
Professional fees	609	382
Government payable	513	0
Accrued interest	493	0
Other	149	25
Compensation and benefits	128	50
Accounts payable	67	0
Total	$ 4,762	$ 2,062

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to expenses related to research and development cost (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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