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Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accrued payroll and related expenses $ 1,643 $ 1,189
Accrued restructuring cost (see Note 15) 516  
Accrued research and development expenses 3,171 1,028
Other 153 510
Total accrued liabilities $ 5,483 $ 2,727