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Equity - Stock-Based Compensation plans (Details) | Dec. 31, 2022 shares | Dec. 31, 2021 shares | Dec. 31, 2020 shares | Dec. 31, 2019 shares
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2015 Plan |  |  |  |
Stock Based Compensation Plans |  |  |  |
Total shares reserved for issuance of common stock related to the conversion of preferred stock | 1,545,722 | 1,900,000 |  |
Ratio of shares subject to award granted |  |  | 1 |
Stock options |  |  |  |
Stock Based Compensation Plans |  |  |  |
Options outstanding (in shares) | 10,000 | 15,000 | 15,000 | 15,000
Options exercisable (in shares) | 10,000 | 15,000 | 15,000 |

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