Income Taxes - Unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended			36 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2022
Summary of unrecognized tax benefits
Unrecognized tax benefits beginning of the period	$ 12,504	$ 12,157	$ 1,885	$ 1,885
Increased related to the current year	216	347	10,272
Unrecognized tax benefits, end of the period	12,720	12,504	12,157	12,720
Income tax - accrual for interest or penalties	0	$ 0	$ 0	0
Unrecognized tax benefits that would impact effective tax rate	$ 0			0
Income tax examination for federal or state				$ 0