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Accrued Liabilities and Other Long-Term Liabilities - Summary of Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Accrued Liabilities And Other Liabilities [Abstract]    
Deferred rent $ 565 $ 458
Leasehold incentive obligation 384 444
Other liabilities — deposits 3 10
Total other long-term liabilities $ 952 $ 912