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Geographic, Customer and Supplier Information - Major Customers (Details) | 12 Months Ended
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Dec. 31, 2017 customer item | Dec. 31, 2016 customer | Dec. 31, 2015 customer
Total revenue | Customer concentration |  |  |
Major customers |  |  |
Number of customers | 10 | 10 | 10
Percentage of revenue contributed by customer | 27.00% | 36.00% | 50.00%
Total revenue | Customer concentration | Customer One |  |  |
Major customers |  |  |
Number of customers |  |  | 1
Percentage of revenue contributed by customer |  |  | 30.00%
Cost of goods sold, product line | Supplier concentration |  |  |
Major customers |  |  |
Number of independent vendors | item | 4 |  |

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