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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
UNITED STATES |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration Risk, Percentage | 90.00% | 89.60% | 89.50% | 88.70% |
Topic 606 |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Accounts receivable | $ 16.3 |  | $ 16.3 |  | $ 19.5

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