Equity - Stock-Based Compensation plans (Details)	3 Months Ended
	Mar. 31, 2024 shares	Mar. 31, 2023 shares
Stock Based Compensation Plans
Stock options granted (in shares)	0	0
Options exercisable (in shares)	0
Options expired	5,000	5,000
Options outstanding (in shares)	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