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Inventories, Net and Significant Suppliers - Changes in Reserve for Excess and Obsolete Inventory (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Schedule of Reserve for Excess and Obsolete Inventory [Rollforward] |  |
Balance at beginning of period | $ 5,138 | $ 4,288
Additions charged to costs and expenses | 7,430 | 5,353
Sell through | (1,220) | (1,240)
(Write-offs)/Foreign exchange effects | (1,838) | (1,118)
Balance at end of period | 9,510 | 7,283
Inventory written-off and scrapped during production | $ 3,800 | $ 1,100

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