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Income Taxes - Unrecognized Tax Benefits (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Income Taxes  
Balance - January 1, 2019 $ 2,424
Increase in tax position 229
Interest accrual 135
Foreign currency remeasurement (34)
Balance - September 30, 2019 $ 2,754