Income Taxes - Rollforward of Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Valuation Allowance [Roll Forward]
Balance at beginning of period	$ (2,484)	$ (2,477)	$ (4,932)
Additions of deferred income tax expense	(234)	(7)	0
Reductions of deferred income tax expense	0	0	2,455
Balance at end of period	$ (2,718)	$ (2,484)	$ (2,477)