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Summary of Significant Accounting Policies - Capitalized Software for Internal Use (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Net capitalized software balance | $ 7.4 | $ 3.5 |
Amortization expense related to capitalized software cost | $ 1.5 | $ 1.3 | $ 1.9
Computer software | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life | 3 years |  |
Computer software | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life | 10 years |  |

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