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Inventories, Net and Significant Supplier - Inventory Reserve (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Schedule of Reserve for Excess and Obsolete Inventory [Rollforward] |  |  |
Balance at beginning of period |  | $ 4,205 | $ 3,045
Additions charged to costs and expenses | [1] | 1,218 | 1,486
Sell through | [2] | (576) | (537)
(Write-offs)/Foreign exchange effects |  | (640) | (445)
Balance at end of period |  | 4,207 | 3,549
Inventory scrapped during production |  | $ 200 | $ 200
[1] | The additions charged to costs and expenses do not include inventory directly written-off that was scrapped during production totaling $0.2 million and $0.2 million for the six months ended June 30, 2017 and 2016, respectively. These amounts are production waste and are not included in management's reserve for excess and obsolete inventory.
[2] | These amounts represent the reduction in reserves associated with inventory items that were sold during the period.

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