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Commitments and Contingencies - Narrative (Details) ft² in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) ft² | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) ft² | Sep. 30, 2020 USD ($) | Dec. 31, 2016 ft²
Guarantor Obligations |  |  |  |  |
Area of real estate property | ft² | 63 |  | 63 |  | 19
Purchase commitment | $ 9.1 |  | $ 9.1 |  |
Purchase commitment period |  |  | 5 years |  |
Company matching contribution, percent |  |  | 50.00% |  |
Employer matching contribution, percent of employees' gross pay |  |  | 6.00% |  |
Requisite service period (in years) |  |  | 1 year |  |
Employer contribution amount | 0.8 | $ 0.5 | $ 2.2 | $ 1.4 |
Unfavorable Regulatory Action |  |  |  |  |
Guarantor Obligations |  |  |  |  |
Estimate of possible loss | 6.0 |  | 6.0 |  |
Letter of Credit |  |  |  |  |
Guarantor Obligations |  |  |  |  |
Letters of credit, amount | 1.5 |  | 1.5 |  |
Restricted Cash | Letter of Credit |  |  |  |  |
Guarantor Obligations |  |  |  |  |
Deposit assets | $ 1.5 |  | $ 1.5 |  |

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