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Revenues - Narrative (Details) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 customer country | Sep. 30, 2017
Revenue from Contract with Customer [Abstract] |  |  |  |
Length of delivery period |  |  | 60 days |
Number of customers (more than) | customer |  |  | 500 |
Number of countries in which customers are located (more than) | country |  |  | 40 |
Length of contract terms |  |  | We typically sell to customers under contracts, with one- to two-year terms on average, or by purchase orders. |
10 Largest Customers [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 48.00% | 44.00% | 45.00% | 43.00%

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