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Inventories, net | 12 Months Ended
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Dec. 31, 2018
Inventories, net |
Inventories, net | Note 7. Inventories, net The components of inventories are as follows:
|  | December 31, |
|  | 2018 |  | 2017 |
|  | (in thousands) |
Raw materials |  | $ | 91,875 |  | $ | 82,313 |
Work in process |  |  | 23,857 |  |  | 31,651 |
Finished goods (completed systems) |  |  | 13,268 |  |  | 6,580 |
Inventories, net |  | $ | 129,000 |  | $ | 120,544 |
When recorded, inventory reserves are intended to reduce the carrying value of inventories to their net realizable value. We establish inventory reserves when conditions exist that indicate inventory may be in excess of anticipated demand or is obsolete based upon assumptions about future demand for our products or market conditions. We regularly evaluate the ability to realize the value of inventories based on a combination of factors including the following: forecasted sales or usage, estimated product end of life dates, estimated current and future market value and new product introductions. Purchasing and usage alternatives are also explored to mitigate inventory exposure. In 2018, we recorded a net decrease of $0.3 million in inventory reserves. As of December 31, 2018 and 2017, inventories are stated net of inventory reserves of $13.9 million and $14.2 million respectively. During each of the years ended 2018, 2017 and 2016, we recorded charges to cost of sales of $2.2 million, $8.1 million and $0.8 million to reflect the lower of cost or net realizable value. We have inventory on consignment at customer locations as of December 31, 2018 and 2017, of $4.6 million and $3.6 million, 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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