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Significant Accounting Policies - Stock-Based Compensation (Details) | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Defined Contribution Plan Disclosure |  |
Expected term | 6 years 3 months | 6 years 3 months
Maximum |  |
Defined Contribution Plan Disclosure |  |
Expiration period | 10 years |

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