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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2017
Inventory Disclosure [Abstract] |
Components of inventory | 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 |
Schedule of inventory reserve | 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 | $ | — |  |  | $ | — |  |  | $ | — |

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