Income taxes - Components of benefit for income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current income tax (benefit) provision
Federal	$ (1,180)	$ 2,048	$ (2)
State	(669)	1,404	7
Total current income tax (benefit) provision	(1,849)	3,452	5
Deferred income tax provision (benefit)
Federal	2,513	(4,111)	(1,236)
State	793	(865)	(432)
Total deferred income tax provision (benefit)	3,306	(4,976)	(1,668)
Total provision for (benefit from) income taxes	$ 1,457	$ (1,524)	$ (1,663)