Income Taxes - Components of loss before income tax and Income tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes
Income tax benefits	$ 0	$ 0	$ 0
Components of loss before income tax
Domestic	(41,307)	(43,241)	(5,995)
Total	$ (41,307)	$ (43,241)	$ (5,995)