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Income Taxes - Provision (benefit) 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 | Dec. 31, 2018
Current (benefit) / provision |  |  |  |  |  |  |
Federal |  |  |  |  | $ (16) | $ (7) | $ (1)
State |  |  |  |  | 188 | 20 | (1)
Foreign |  |  |  |  | 657 | (370) | 1,024
Total current (benefit) / provision |  |  |  |  | 829 | (357) | 1,022
Deferred (benefit) / provision |  |  |  |  |  |  |
Federal |  |  |  |  | 7 | 1 | 1
State |  |  |  |  | 4 | 7 | 2
Foreign |  |  |  |  | 101 | (9) | (123)
Total deferred (benefit) / provision |  |  | $ (4,336) | $ (94) | 112 | (1) | (55)
Total (benefit) / provision |  |  |  |  |  |  |
Total Federal |  |  |  |  | (9) | (6) |
Total state |  |  |  |  | 192 | 27 | 1
Total foreign |  |  |  |  | 758 | (379) | 901
Total provision (benefit) for income taxes | $ (353) | $ (12) | $ (5,011) | $ (797) | $ 941 | $ (358) | $ 902

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