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Inventory | 12 Months Ended
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Dec. 28, 2018
Inventory Disclosure [Abstract] |
Inventory | INVENTORY Inventory consisted of the following (in thousands):
| December 31,
| 2018 |  | 2017
Raw materials | $ | 1,922 |  |  | $ | 498 |
Work in process | 6,170 |  |  | 3,997 |
Finished goods | 3,836 |  |  | 2,854 |
Total | $ | 11,928 |  |  | $ | 7,349 |
Balance Sheet classification: |  |  |
Inventory | $ | 9,838 |  |  | $ | 6,657 |
Inventory included in Other long-term assets | 2,090 |  |  | 692 |
Total | $ | 11,928 |  |  | $ | 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 $1.1 million, $1.2 million and $0.5 million for the years ended December 31, 2018, 2017 and 2016, respectively. 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 in the accompanying Consolidated Balance Sheets. As of both December 31, 2018 and 2017, the non-current portion of inventory consisted of a portion of our finished goods.

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- References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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