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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]            
Provision for income taxes $ 101 $ 176 $ 328 $ 384 $ 577 $ 464