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Accrued Liabilities and Other Long-Term Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Accrued Liabilities And Other Liabilities [Abstract]    
Accrued compensation and benefits $ 2,889 $ 2,971
Accrued research and development expenses 3,970 2,624
Other accrued liabilities 1,014 1,263
Deferred rent 13 64
Total accrued liabilities $ 7,886 $ 6,922