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Inventories
 6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories Inventories
The components of inventories are as follows:
 
June 30,
2018
 
December 31,
2017
 
(in thousands)
Work-in-process
$
25,565

 
$
22,579

Finished goods
25,184

 
27,247

Total
50,749

 
49,826

Less: Inventories - current
(13,245
)
 
(15,886
)
Inventories - non-current
$
37,504

 
$
33,940

A portion of inventory is classified as non-current as of June 30, 2018 and December 31, 2017 based on forecasted consumption exceeding one year. During the three and six months ended June 30, 2018, there were immaterial charges for excess or obsolete inventory in the Unaudited Condensed Consolidated Statements of Operations. During the three and six months ended June 30, 2017, the Company recorded $1.5 million for charges for excess or obsolete inventory in the Unaudited Condensed Consolidated Statements of Operations.