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Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |
US corporate tax rate | 21.00% | 21.00% | 21.00% | 21.00% | 35.00%
Federal |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax refund |  | $ 0.8 | $ 0.8 |  |

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