Income Taxes - Uncertain tax position liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1	$ 1,587	$ 5,300
Increases related to prior period tax positions	0	96
Balance, March 31	$ 1,587	$ 5,396