Income Taxes - Income Tax Benefit Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of unrecognized tax benefits
Balance at January 1	$ 402	$ 667	$ 1,919
Additions based on positions related to current period	62	101	158
Reductions based on positions related to prior period	0	(314)	(1,410)
Reductions due to lapse of statute of limitations	(56)	(52)	0
Balance at December 31	$ 408	$ 402	$ 667