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Share-Based Compensation - Stock option valuation assumptions (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Compensation
Options exercised	0	0	0
Total fair value of option vested during the period			$ 0.2
Employee Stock Option
Share-Based Compensation
Dividend yield (as a percent)			0.00%
Volatility (as a percent)			111.50%
Expected life (in years)			4 years
Employee Stock Option \| Weighted-Average
Share-Based Compensation
Weighted average fair value of options granted (in dollars per share)			$ 111.23
Weighted average risk free interest rate (as a percent)			3.69%