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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accrued Expenses    
Payroll and related costs $ 1,807 $ 2,514
Clinical trials and drug development 2,802 1,849
Professional fees 673 396
Short-term lease liabilities 479 446
Other 9 63
Total accrued expenses $ 5,770 $ 5,268