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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, 2019 USD ($)
Changes in accumulated other comprehensive income, net of tax |
Balance at December 31, 2018 | $ 448
Other comprehensive income and pension reclassification | (706)
Balance at December 31, 2019 | (258)
Foreign currency |
Changes in accumulated other comprehensive income, net of tax |
Balance at December 31, 2018 | 962
Other comprehensive income and pension reclassification | (444)
Balance at December 31, 2019 | 518
Defined benefit pension plan |
Changes in accumulated other comprehensive income, net of tax |
Balance at December 31, 2018 | (514)
Other comprehensive income and pension reclassification | (262)
Balance at December 31, 2019 | $ (776)

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