Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance of unrecognized tax benefits at beginning of year	$ 822	$ 752	$ 520
Additions based on tax positions related to the current period	0	70	340
Reductions for tax positions of prior periods	(101)	0	(108)
Balance of unrecognized tax benefits at end of year	$ 721	$ 822	$ 752