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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Changes in accumulated other comprehensive income, net of tax
Balance at December 31, 2020	$ 3,435
Other comprehensive income and pension reclassification	(1,670)
Balance at September 30, 2021	1,765
Foreign currency
Changes in accumulated other comprehensive income, net of tax
Balance at December 31, 2020	3,945
Other comprehensive income and pension reclassification	(1,881)
Balance at September 30, 2021	2,064
Defined benefit plans
Changes in accumulated other comprehensive income, net of tax
Balance at December 31, 2020	(510)
Other comprehensive income and pension reclassification	211
Balance at September 30, 2021	$ (299)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for net periodic benefit cost (credit) of defined benefit plan.

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