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Accrued Expenses and Other Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accrued expenses and other liabilities    
Research and development related costs $ 2,120 $ 5,032
Payroll and related costs 6,250 7,427
Accounting, tax and audit services 465 398
Other 2,367 1,645
Total other current liabilities $ 11,202 $ 14,502