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Business - Additional Information (Q3) (Details) - Country | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Product Information [Line Items] |  |
Number of countries company operates | 31 | 31
Number of countries where product is found (more than) |  | 100
Sales Revenue Outside United States | Customer Concentration Risk |  |
Product Information [Line Items] |  |
Revenues from customers outside the U.S. (as a percent) | 66.00% |
Minimum |  |
Product Information [Line Items] |  |
Number of countries where product is found (more than) | 100 |

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