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Income Taxes - Provision For 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
Current taxes:            
Federal         $ 0 $ 0
Foreign         640 356
State         27 25
Total current taxes         667 381
Deferred taxes:            
Federal         0
Foreign         (90) 83
State         0
Total deferred taxes         (90) 83
Provision for income taxes $ 101 $ 176 $ 328 $ 384 $ 577 $ 464