Stock-based Compensation - Additional information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Stock-based Compensation
Options that exercised after the Merger from Cara			21,665
Forfeitures of assumed Cara options after the Merger			83,293
Aggregate intrinsic value of options exercised	$ 0.1	$ 0.0	$ 0.2
Options granted	2,000	0	399,940	3,352
Weighted-average grant-date fair value of options granted	$ 23.54		$ 11.2	$ 4.62
Total unrecognized compensation cost of options	$ 3.7		$ 3.7
Unrecognized compensation cost, options weighted-average period of recognition	2 years 10 months 13 days		2 years 10 months 13 days
Maximum
Stock-based Compensation
Aggregate intrinsic value of options exercised				$ 0.1