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Inventory | 6 Months Ended
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Jun. 29, 2018
Inventory Disclosure [Abstract] |
INVENTORY | INVENTORY Inventory consisted of the following (in thousands):
| June 30, 2018 |  | December 31, 2017
Raw materials | $ | 2,134 |  |  | $ | 498 |
Work in process | 3,737 |  |  | 3,997 |
Finished goods | 3,265 |  |  | 2,854 |
Total | $ | 9,136 |  |  | $ | 7,349 |
Balance Sheet classification: |  |  |
Inventory | $ | 8,371 |  |  | $ | 6,657 |
Other long-term assets | 765 |  |  | 692 |
Total | $ | 9,136 |  |  | $ | 7,349 |
Write-downs related to excess and expiring inventory are charged to either Cost of goods sold or the cost of supplied product included in Collaboration revenues. Such write-downs were $0.5 million for both the six months ended June 30, 2018 and June 30, 2017. Inventory expected to be used in production or sold in periods more than 12 months from the date presented is classified as Other long-term assets on the accompanying Condensed Consolidated Balance Sheets. As of both June 30, 2018 and December 31, 2017, the non-current portion of inventory consisted of a portion of our finished goods.

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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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