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Equity - Stock-Based Compensation plans (Details) | 3 Months Ended
--- | ---
Mar. 31, 2023 shares | Mar. 31, 2022 shares
Stock Based Compensation Plans |  |
Options outstanding (in shares) | 5,000 |
Options exercisable (in shares) | 5,000 |
Options expired and cancelled (in shares) | 5,000 | 5,000
Stock options granted (in shares) | 0 | 0
2015 Plan |  |
Stock Based Compensation Plans |  |
Ratio of shares subject to award granted | 1 |
2021 Plan |  |
Stock Based Compensation Plans |  |
Total shares reserved for issuance of common stock related to the conversion of preferred stock | 1,900,000 |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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