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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Unrecognized tax benefits      
Balance at beginning of the year $ 13,486 $ 7,227 $ 5,947
Net additions for tax positions - prior years 230 4,558  
Net additions for tax positions - current year 2,339 1,701 1,280
Subtractions from tax positions - prior years (537)    
Subtractions from tax positions - current year (442)    
Balance at end of the year 15,076 13,486 7,227
Amount that would impact the effective tax rate if uncertain tax benefits were recognized 400    
Accrued interest and penalties associated with uncertain tax positions $ 0 $ 0 $ 0