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Income Taxes - Uncertain Tax Positions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Uncertain Tax Positions      
Balance at beginning of year $ 2,141 $ 1,101 $ 343
Increases for prior positions 70 97 37
Increases for current year positions 775 943 721
Other increases 0 0 0
Decreases due to settlements 0 0 0
Expiration of the statute of limitations for the assessment of taxes 0 0 0
Other decreases (3) 0 0
Balance at end of year $ 2,983 $ 2,141 $ 1,101