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Inventories, Net and Significant Suppliers | 12 Months Ended
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Dec. 31, 2019
Inventory Disclosure [Abstract] |
Inventories, Net and Significant Suppliers | Inventories, Net and Significant Suppliers Inventories, net were as follows:
| December 31,
(In thousands) | 2019 |  | 2018
Raw materials | $ | 61,220 |  |  | $ | 68,834 |
Components | 25,239 |  |  | 25,071 |
Work in process | 1,526 |  |  | 5,577 |
Finished goods | 68,175 |  |  | 50,006 |
Reserve for excess and obsolete inventory | (11,025 | ) |  | (5,138 | )
Inventories, net | $ | 145,135 |  |  | $ | 144,350 |
Reserve for Excess and Obsolete Inventory Changes in the reserve for excess and obsolete inventory were as follows:
| Year Ended December 31,
(In thousands) | 2019 |  | 2018 |  | 2017
Balance at beginning of period | $ | 5,138 |  |  | $ | 4,288 |  |  | $ | 4,205 |
Additions charged to costs and expenses | 12,792 |  |  | 6,702 |  |  | 3,685 |
Sell through (1) | (1,500 | ) |  | (1,825 | ) |  | (1,242 | )
(Write-offs)/Foreign exchange effects | (5,405 | ) |  | (4,027 | ) |  | (2,360 | )
Balance at end of period | $ | 11,025 |  |  | $ | 5,138 |  |  | $ | 4,288 |
(1) | These amounts represent the reversal of reserves associated with inventory items that were sold during the period.
Significant Suppliers 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,
| 2019 |  | 2018 |  | 2017
| $ (thousands) |  | % of Total Inventory Purchases |  | $ (thousands) |  | % of Total Inventory Purchases |  | $ (thousands) |  | % of Total Inventory Purchases
Texas Instruments | — |  | (1) | — | (1) | — |  | (1) | — | (1) | $ | 42,058 |  |  | 10.0 | %
(1) Purchases associated with this supplier did not total more than 10% of our total inventory purchases for the indicated period. Accounts payable from our supplier, Zhejiang Zhen You Electronics Co. Ltd., totaled $11.4 million or 11.1% of our accounts payable balance at December 31, 2019. Related Party Supplier During the years ended December 31, 2018 and 2017, we purchased certain printed circuit board assemblies from a related party supplier. The supplier was considered a related party for financial reporting purposes because our Senior Vice President of Strategic Operations owned 40% of this supplier. In the second quarter of 2018, our Senior Vice President sold his interest in this supplier, and thus this supplier is no longer considered a related party. Total inventory purchases made from this supplier while it was a related party were $1.1 million and $5.2 million during the twelve months ended December 31, 2018, and 2017, respectively.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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