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Inventories | 12 Months Ended
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Dec. 31, 2017
Inventory Disclosure [Abstract] |
Inventories | Inventories The components of inventories and the related changes in the allowance for excess and obsolete inventories are as follows:
| December 31,
| 2017 |  | 2016
| (in thousands)
Raw materials | $ | 57,784 |  |  | $ | 43,438 |
Work in process | 5,957 |  |  | 2,279 |
Finished goods | 8,163 |  |  | 3,017 |
| 71,904 |  |  | 48,734 |
Less: Allowance for excess and obsolete inventories | (1,118 | ) |  | (1,382 | )
Total, net | $ | 70,786 |  |  | $ | 47,352 |
| Years Ending December 31,
| 2017 |  | 2016 |  | 2015
Allowance for excess and obsolete inventories: | (in thousands)
Balance, beginning of period | $ | 1,382 |  |  | $ | 757 |  |  | $ | 714 |
Provisions for excess and obsolete inventories | 102 |  |  | 625 |  |  | 178 |
Inventories written off | (366 | ) |  | — |  |  | (135 | )
Balance, end of period | $ | 1,118 |  |  | $ | 1,382 |  |  | $ | 757 |

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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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