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Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accrued payroll and related expenses $ 1,533 $ 1,189
Accrued research and development expenses 514 1,028
Other 173 510
Total accrued liabilities $ 2,220 $ 2,727