Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Prepaid Expenses and Other Current Assets
Prepaid clinical development expenses	$ 1,999	$ 1,966
Prepaid insurance	1,517	3,167
Other prepaid expenses	665	331
Prepaid legal expenses		270
Other current receivables	6	7
Total prepaid expenses and other current assets	$ 4,187	$ 5,741