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Income Taxes - Deferred Tax Valuation Allowance (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Valuation Allowance [Line Items] |  |  |
Beginning balance | $ 59,349 | $ 76,395 | $ 62,605
Additions | 25,193 | 5,332 | 13,790
Reduction in valuation allowance due to rate change from Tax Act | (22,378) |  |
Increase in valuation allowance due to rate change from Tax Act | 5,824 |  |
Ending balance | $ 90,366 | $ 59,349 | $ 76,395

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