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Inventories, Net and Significant Suppliers (Tables) | 12 Months Ended
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Dec. 31, 2017
Inventory Disclosure [Abstract] |
Schedule of Inventories, Net | Inventories, net were as follows:
| December 31,
(In thousands) | 2017 |  | 2016
Raw materials | $ | 43,638 |  |  | $ | 33,059 |
Components | 16,214 |  |  | 15,046 |
Work in process | 1,847 |  |  | 5,860 |
Finished goods | 105,178 |  |  | 80,119 |
Reserve for excess and obsolete inventory | (4,288 | ) |  | (4,205 | )
Inventories, net | $ | 162,589 |  |  | $ | 129,879 |
Schedule of Reserve for Excess and Obsolete Inventory | Changes in the reserve for excess and obsolete inventory were as follows:
| Year Ended December 31,
(In thousands) | 2017 |  | 2016 |  | 2015
Balance at beginning of period | $ | 4,205 |  |  | $ | 3,045 |  |  | $ | 2,539 |
Additions charged to costs and expenses (1) | 3,685 |  |  | 3,464 |  |  | 3,070 |
Sell through (2) | (1,242 | ) |  | (1,116 | ) |  | (1,108 | )
(Write-offs)/Foreign exchange effects | (2,360 | ) |  | (1,188 | ) |  | (1,456 | )
Balance at end of period | $ | 4,288 |  |  | $ | 4,205 |  |  | $ | 3,045 |
(1) | The additions charged to costs and expenses do not include inventory directly written-off that was scrapped during production totaling $0.4 million, $0.3 million, and $0.3 million for the years ended December 31, 2017, 2016, and 2015, respectively. These amounts are production waste and are not included in management’s reserve for excess and obsolete inventory.
(2) | These amounts represent the reversal of reserves associated with inventory items that were sold during the period.
Schedule of Significant Supplier Transactions | We purchase integrated circuits, components and finished goods from multiple sources. Purchases from the following supplier totaled more than 10% of our total inventory purchases:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015 (1)
| $ (thousands) |  | % of Total Inventory Purchases |  | $ (thousands) |  | % of Total Inventory Purchases |  | $ (thousands) |  | % of Total Inventory Purchases
Texas Instruments | $ | 42,058 |  |  | 10.0 | % |  | $ | 42,370 |  |  | 11.7 | % |  | $ | — |  |  | — | %
(1) No single supplier provided more than 10% of our total inventory purchases during the year ended December 31, 2015.
Schedule of Related Party Transactions | Inventory purchases from this supplier were as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| $ (thousands) |  | % of Total Inventory Purchases |  | $ (thousands) |  | % of Total Inventory Purchases |  | $ (thousands) |  | % of Total Inventory Purchases
Related party supplier | $ | 5,217 |  |  | 1.2 | % |  | $ | 6,350 |  |  | 1.8 | % |  | $ | 8,550 |  |  | 2.5 | %
Total accounts payable to this supplier were as follows:
| December 31,
| 2017 |  | 2016
| $ (thousands) |  | % of Accounts Payable |  | $ (thousands) |  | % of Accounts Payable
Related party supplier | $ | 1,500 |  |  | 1.3 | % |  | $ | 1,690 |  |  | 1.7 | %

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