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Inventories, net | 3 Months Ended
--- | ---
Mar. 31, 2022
Inventories, net |
Inventories, net | Note 9. Inventories, net ​ The components of inventories are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31, | ​
​ |  | 2022 |  | 2021 |
​ | ​ | (in thousands) | ​
Raw materials | ​ | $ | 140,138 | ​ | $ | 133,784 | ​
Work in process | ​ |  | 45,537 | ​ |  | 43,164 | ​
Finished goods (completed systems) | ​ |  | 18,163 | ​ |  | 18,036 | ​
Inventories, net | ​ | $ | 203,838 | ​ | $ | 194,984 | ​
​ When recorded, inventory reserves 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We establish inventory reserves when conditions exist that indicate inventory may be in excess of anticipated demand or is obsolete based upon assumptions about future demand for the Company’s products or market conditions.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.

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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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