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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2019
Inventory Disclosure [Abstract] |
Components of inventory | Inventories are as follows (in thousands):
| December 31,
| 2019 |  | 2018
Raw materials | $ | 4,339 |  |  | $ | 10,608 |
Work-in-process | — |  |  | — |
Finished goods | 23,056 |  |  | 18,798 |
Inventories | 27,395 |  |  | 29,406 |
Less reserve for excess and obsolete inventory | (5,698 | ) |  | (2,117 | )
Inventories, net | $ | 21,697 |  |  | $ | 27,289 |
Schedule of inventory reserve | Changes in the reserve for excess and obsolete inventory are as follows (in thousands):
| 2019 |  | 2018 |  | 2017
Balance, beginning of year | $ | 2,117 |  |  | $ | 368 |  |  | $ | 50 |
Charged to provisions | 5,659 |  |  | 2,418 |  |  | 388 |
Deductions for disposals | (2,078 | ) |  | (669 | ) |  | (70 | )
Balance, end of the year | $ | 5,698 |  |  | $ | 2,117 |  |  | $ | 368 |

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