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Stockholders' Equity (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2018 | May 05, 2017
Maximum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Requirement to own shares outstanding as percent |  |  |  |  |  |  | 4.99%
Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Remaining authorized amount | $ 7,000,000 |  | $ 7,000,000 |  | $ 2,900,000 |  |
Authorized incremental amount |  |  |  |  | $ 7,100,000 |  |
Stock repurchased (in shares) | 0 | 0 | 0 | 20,613 |  |  |
Stock repurchased |  | $ 0 |  | $ 200,000 |  |  |
Common Stock | Maximum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Authorized amount |  |  |  |  |  | $ 20,000,000 |

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