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Income Taxes - Additional information (Details) - USD ($) $ in Millions | 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
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Statutory tax rate (as a percent) | 21.00% | 21.00% | 21.00% | 21.00% | 21.00% | 21.00% | 21.00%
Effective income tax rate | 9.00% | 0.60% | 24.20% | 3.60% | 7.80% | 1.00% | (1.20%)
Increase decrease in valuation allowance |  |  |  |  | $ 3.7 | $ 6.3 | $ 18.8
Domestic Tax Authority [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Net operating losses |  |  |  |  | 277.0 |  |
Net operating losses subject to expiration |  |  |  |  | $ 198.0 |  |
Percentage of offset of future taxable income |  |  |  |  | 100.00% |  |
operating losses indefinite lived carryforward |  |  |  |  | $ 79.0 |  |
Percentage of offset of future taxable income for indefinite lived carryforward losses |  |  |  |  | 80.00% |  |
Operating loss carry forward period |  |  |  |  | 2019 |  |
State |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Net operating losses |  |  |  |  | $ 8.9 |  |
Federal research and development tax credits |  |  |  |  | $ 7.6 |  |
Operating loss carry forward period |  |  |  |  | 2016 |  |

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