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]
Total unrecognized tax benefits at January 1	$ 469	$ 469	$ 0
Gross amount of increases for prior years' tax positions	0	0	469
Total unrecognized tax benefits at December 31	$ 469	$ 469	$ 469