Stockholders' Equity and Share-Based Compensation - Share-based compensation expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Share-Based Compensation
Share-based compensation expense	$ 525	$ 923	$ 1,081	$ 1,781
Research and development
Share-Based Compensation
Share-based compensation expense	49	248	191	492
General and administrative
Share-Based Compensation
Share-based compensation expense	$ 476	$ 675	$ 890	$ 1,289