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Inventories, Net and Significant Suppliers - Purchases from Significant Suppliers (Details) - Texas Instruments - Supplier Concentration Risk - Inventory Purchases - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Concentration Risk [Line Items] |  |
Purchases from significant supplier | $ 0 | $ 9,128
Percent of total inventory purchases | 0.00% | 10.40%

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