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Inventories, Net and Significant Supplier - Related Party Supplier (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Executive Vice President |  |  |  |  |
Related Party Transaction |  |  |  |  |
Ownership percentage in third party by executive |  |  | 40.00% |  |
Affiliated Entity | Related party supplier | Cost of goods |  |  |  |  |
Related Party Transaction |  |  |  |  |
Purchases from related party | $ 1,378 | $ 1,382 | $ 3,962 | $ 4,971 |
Concentration risk percentage | 1.30% | 1.50% | 1.30% | 1.80% |
Affiliated Entity | Related party supplier | Accounts payable |  |  |  |  |
Related Party Transaction |  |  |  |  |
Concentration risk percentage |  |  | 1.60% |  | 1.70%
Accounts payable | $ 1,763 |  | $ 1,763 |  | $ 1,690

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