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Inventories, Net and Significant Supplier - Inventory Reserve (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 | Sep. 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 | 1,960 | 2,120
Sell through | (950) | (781)
(Write-offs)/Foreign exchange effects | (2,090) | (726)
Balance at end of period | 3,125 | 3,658
Inventory scrapped during production | $ 200 | $ 300

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