Employee Benefits - Amounts in Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amounts Recognized in the Consolidated Balance Sheets:
Current accrued expenses and other current liabilities	$ 1,913	$ 1,913
Non-current other liabilities	16,022	17,833
Total accrued liabilities	$ 17,935	$ 19,746