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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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