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Inventory
9 Months Ended
Sep. 28, 2018
Inventory Disclosure [Abstract]  
INVENTORY
INVENTORY
Inventory consisted of the following (in thousands):
 
September 30,
2018
 
December 31, 2017
Raw materials
$
2,344

 
$
498

Work in process
5,203

 
3,997

Finished goods
4,082

 
2,854

Total
$
11,629

 
$
7,349

 
 
 
 
Balance Sheet classification:
 
 
 
Inventory
$
10,433

 
$
6,657

Other long-term assets
1,196

 
692

Total
$
11,629

 
$
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 $0.8 million and $1.2 million for the nine months ended September 30, 2018 and September 30, 2017, 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 Condensed Consolidated Balance Sheets. As of both September 30, 2018 and December 31, 2017, the non-current portion of inventory consisted of a portion of our finished goods.