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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2018
Inventory Disclosure [Abstract] |
Components of inventory | Inventories are as follows (in thousands):
| December 31,
| 2018 |  | 2017
Raw materials | $ | 10,608 |  |  | $ | 13,462 |
Work-in-process | — |  |  | 3 |
Finished goods | 18,798 |  |  | 19,363 |
Inventories | 29,406 |  |  | 32,828 |
Less reserve for excess and obsolete inventory | (2,117 | ) |  | (368 | )
Inventories, net | $ | 27,289 |  |  | $ | 32,460 |
Schedule of inventory reserve | Changes in the reserve for excess and obsolete inventory are as follows (in thousands):
| 2018 |  | 2017 |  | 2016
Balance, beginning of year | $ | 368 |  |  | $ | 50 |  |  | $ | 50 |
Charged to costs and expenses | 2,418 |  |  | 388 |  |  | — |
Deductions | (669 | ) |  | (70 | ) |  | — |
Balance, end of the year | $ | 2,117 |  |  | $ | 368 |  |  | $ | 50 |

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