Stock-Based Compensation - Stock-based compensation expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Stock-Based Compensation
Total stock-based compensation expense	$ 1,574	$ 1,861	$ 4,918	$ 5,452
Research and development expense
Stock-Based Compensation
Total stock-based compensation expense	384	548	1,275	1,670
General and administrative expense
Stock-Based Compensation
Total stock-based compensation expense	$ 1,190	$ 1,313	$ 3,643	$ 3,782