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Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accrued payroll and related expenses $ 557 $ 1,189
Accrued research and development expenses 524 1,028
Other 164 510
Total accrued liabilities $ 1,245 $ 2,727