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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Beginning balance $ 2,109 $ 1,812
Increases to current year tax positions 326 297
Ending balance $ 2,435 $ 2,109