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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accrued Expenses    
Compensation and related benefits $ 1,051 $ 2,310
Interest 43 41
Professional fees 1,371 641
Research and development expenses 15 35
Other 354 506
Accrued Expenses, Total $ 2,834 $ 3,533