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Summary of Significant Accounting Policies - Stock-Based Compensation (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Contribution Plan Disclosure |  |  |
Expected term | 6 years 3 months | 6 years 3 months | 6 years 3 months
Maximum |  |  |
Defined Contribution Plan Disclosure |  |  |
Expiration period | 10 years | 10 years | 10 years

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