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Inventories, Net and Significant Suppliers
 12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
Inventories, Net and Significant Suppliers
Inventories, Net and Significant Supplier
Inventories, net were as follows:
 
 
December 31,
(In thousands)
2015
 
2014
Raw materials
$
29,290

 
$
24,763

Components
12,228

 
16,170

Work in process
5,671

 
2,622

Finished goods
78,222

 
56,458

Reserve for excess and obsolete inventory
(3,045
)
 
(2,539
)
Inventories, net
$
122,366

 
$
97,474



Reserve for Excess and Obsolete Inventory

Changes in the reserve for excess and obsolete inventory were as follows:
 
Year Ended December 31,
(In thousands)
2015
 
2014
 
2013
Balance at beginning of period
$
2,539

 
$
2,714

 
$
2,024

Additions charged to costs and expenses (1)
3,070

 
3,181

 
3,387

Sell through (2)
(1,108
)
 
(869
)
 
(365
)
Write-offs/FX effects
(1,456
)
 
(2,487
)
 
(2,332
)
Balance at end of period
$
3,045

 
$
2,539

 
$
2,714

 
(1) 
The additions charged to costs and expenses do not include inventory directly written-off that was scrapped during production totaling $0.3 million, $0.3 million, and $0.3 million for the years ended December 31, 2015, 2014, and 2013, 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.
Significant Supplier
We purchase integrated circuits, components and finished goods from multiple sources. Maxim Integrated Products International Limited provided $31.2 million or 10.7% of total inventory purchases during the year ended December 31, 2014. No single supplier provided more than 10% of our total inventory purchases during the years ended December 31, 2015 and 2013.

Related Party Supplier
We purchase certain printed circuit board assemblies from a related party supplier. The supplier is considered a related party for financial reporting purposes because our Senior Vice President of Manufacturing owns 40% of this supplier. Inventory purchases from this supplier were as follows:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
Amount (thousands)
 
% of Total Inventory Purchases
 
Amount (thousands)
 
% of Total Inventory Purchases
 
Amount (thousands)
 
% of Total Inventory Purchases
Related party supplier
$
8,550

 
2.5
%
 
$
9,188

 
3.2
%
 
$
9,846

 
3.5
%
Total accounts payable to this supplier were as follows:
 
December 31,
 
2015
 
2014
 
Amount (thousands)
 
% of Accounts Payable
 
Amount (thousands)
 
% of Accounts Payable
Related party supplier
$
2,361

 
2.5
%
 
$
2,378

 
3.4
%


Our payable terms and pricing with this supplier are consistent with the terms offered by other suppliers in the ordinary course of business. The accounting policies that we apply to our transactions with our related party supplier are consistent with those applied in transactions with independent third parties. Corporate management routinely monitors purchases from our related party supplier to ensure these purchases remain consistent with our business objectives.