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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Details) $ in Thousands | 12 Months Ended
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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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