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Inventory
6 Months Ended
Jun. 28, 2019
Inventory Disclosure [Abstract]  
INVENTORY INVENTORY
Inventory consisted of the following (in thousands):
 
June 30,
2019
 
December 31, 2018
Raw materials
$
2,482

 
$
1,922

Work in process
8,571

 
6,170

Finished goods
6,630

 
3,836

Total
$
17,683

 
$
11,928

 
 
 
 
Balance Sheet classification:
 
 
 
Current portion included in Inventory
$
12,352

 
$
9,838

Long-term portion included in Other long-term assets
5,331

 
2,090

Total
$
17,683

 
$
11,928


Write-downs related to excess and expiring inventory are charged to Cost of goods sold or the cost of supplied product included in Collaboration revenues. Such write-downs were $0.4 million and $0.5 million for the six months ended June 30, 2019 and 2018, respectively.
Inventory not expected to be used in production or sold in the next 12 months is classified as Other long-term assets in the accompanying Condensed Consolidated Balance Sheets. As of both June 30, 2019 and December 31, 2018, the long-term portion of inventory consisted of portions of our raw materials and finished goods, and as of June 30, 2019, also a portion of our work in process.