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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Income Taxes |  |
Balance - January 1, 2020 | $ 2,957 | $ 2,424
Increase for current year tax position | 308 | 355
Decrease for prior year tax position | (161) |
Interest accrual | 199 | 234
Foreign currency remeasurement | (72) | (56)
Balance - September 30, 2020 | $ 3,231 | $ 2,957

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