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Balance Sheet Information - Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]    
Deferred revenue, non-current $ 3,186 $ 2,104
CARES Act payroll tax deferral 1,676 1,676
Other long-term liabilities 194 620
Total other long-term liabilities $ 5,056 $ 4,400