Income Taxes - Components of benefit for income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current income tax provision (benefit)
Federal	$ (2)	$ (24)	$ 49
State	7	(27)	61
Total current income tax provision (benefit)	5	(51)	110
Deferred income tax (benefit) provision
Federal	(1,236)	(435)	(295)
State	(432)	(238)	(69)
Total deferred income tax (benefit)	(1,668)	(673)	(364)
Total benefit from income taxes	$ (1,663)	$ (724)	$ (254)