Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Accrued Expenses
Employee compensation expenses	$ 3,830	$ 4,389
Research and development expenses	3,587	1,278
Litigation settlements (see Note 16)		2,650
Other	1,737	1,734
Total accrued expenses	$ 9,154	$ 10,051