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Inventories | 6 Months Ended
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Jun. 30, 2018
Inventory Disclosure [Abstract] |
Inventories | Note 6. Inventories Inventories, net of inventory writedowns, consist of the following for the periods indicated (in thousands):
|  | June 30, 2018 |  | December 31, 2017 |
Raw materials |  | $ | 27,078 |  | $ | 26,648 |
Work in process and sub-assemblies |  |  | 48,068 |  |  | 31,060 |
Finished goods |  |  | 18,123 |  |  | 18,060 |
|  | $ | 93,269 |  | $ | 75,768 |
The lower of cost or market adjustment expensed for inventory for the three months ended June 30, 2018 and 2017 was $1.5 million and $0.2 million, respectively. The lower of cost or market adjustment expensed for inventory for the six months ended June 30, 2018 and 2017 was $2.4 million and $0.7 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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