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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

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