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Geographic, Customer and Supplier Information - Major Customers (Details) | 12 Months Ended
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Dec. 31, 2018 item customer | Dec. 31, 2017 customer | Dec. 31, 2016 customer
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |
Major customers |  |  |
Number of customers | customer | 10 | 10 | 10
Percentage of revenue contributed by customer | 24.00% | 27.00% | 36.00%
Cost of goods sold, product line | Supplier concentration |  |  |
Major customers |  |  |
Number of independent vendors | item | 4 |  |

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