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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Gross unrecognized tax benefits—beginning balance $ 10,200 $ 17,370 $ 14,130
Increase related to tax positions taken during prior year 108 0 0
Decrease related to tax positions taken during prior year (2) (7,739) 0
Increase related to tax positions taken during current year 667 569 3,240
Gross unrecognized tax benefits—ending balance $ 10,973 $ 10,200 $ 17,370