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Inventories | 12 Months Ended
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Dec. 31, 2017
Inventory Disclosure [Abstract] |
Inventories | Inventories Inventories are as follows (in thousands):
| December 31,
| 2017 |  | 2016
Raw materials | $ | 42,682 |  |  | $ | 28,626 |
Work-in-process | 3,284 |  |  | 2,918 |
Finished goods | 29,793 |  |  | 26,739 |
Inventories | $ | 75,759 |  |  | $ | 58,283 |
Changes in the reserve for excess and obsolete inventory are as follows (in thousands):
| 2017 |  | 2016 |  | 2015
Balance, beginning of year | $ | — |  |  | $ | — |  |  | $ | — |
Charged to costs and expenses | 724 |  |  | 1,301 |  |  | 16 |
Deductions | (724 | ) |  | (1,301 | ) |  | (16 | )
Balance, end of the year | $ | — |  |  | $ | — |  |  | $ | — |
During the years ended December 31, 2017, 2016, and 2015, all inventory items identified as excess and obsolete inventory were charged to costs and expenses.

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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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