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Income Taxes - Unrecognized Tax Benefit (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Unrecognized Tax Benefit Activity [Roll Forward]      
Beginning balance $ 3,954 $ 1,686 $ 448
Additions based on tax positions related to the current year 1,087 2,268 1,578
Increases (decreases) for tax positions of prior years 274 0 (340)
Ending balance $ 5,315 $ 3,954 $ 1,686