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Inventories (Tables) | 9 Months Ended
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Sep. 30, 2019
Inventory Disclosure [Abstract] |
Inventories | The components of inventories are as follows:
| September 30, 2019 |  | December 31, 2018
| (in thousands) |  |
Raw materials | $ | 74,950 |  |  | $ | 67,995 |
Work in process | 2,271 |  |  | 4,060 |
Finished goods | 5,602 |  |  | 6,767 |
Total, gross | 82,823 |  |  | 78,822 |
Less: Allowance for excess and obsolete inventories | (2,200) |  |  | (1,210) |
Total, net | $ | 80,623 |  |  | $ | 77,612 |
Inventories (Allowance) | The related changes in the allowance for excess and obsolete inventories account are as follows:
| Three months ended |  |  |  | Nine months ended |  |
| September 30, 2019 |  | September 30, 2018 |  | September 30, 2019 |  | September 30, 2018
Allowance for excess and obsolete inventories: | (in thousands) |  |  |  |  |  |
Balance, beginning of period | $ | 2,350 |  |  | $ | 1,407 |  |  | $ | 1,210 |  |  | $ | 1,118 |
Provisions for excess and obsolete inventories | (150) |  |  | (263) |  |  | 1,003 |  |  | 55 |
Inventories written off | — |  |  | (30) |  |  | (13) |  |  | (59) |
Balance, end of period | $ | 2,200 |  |  | $ | 1,114 |  |  | $ | 2,200 |  |  | $ | 1,114 |

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