Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Prepaid Expenses and Other Current Assets
Prepaid insurance	$ 3,167	$ 3,224
Prepaid clinical development expenses	1,966	512
Other prepaid expenses	331	345
Prepaid legal expenses	270
Other current receivables	7
Prepaid manufacturing expenses		1,028
Total prepaid expenses and other current assets	$ 5,741	$ 5,109