Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Accrued Expenses
Employee compensation expenses	$ 2,603	$ 3,910
Research and development expenses	124	6,661
Licensing expenses	1,084	5,478
Restructuring expenses (Note 13)	502	3,112
Other expenses	409	285
Total accrued expenses	$ 4,722	$ 19,446