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Inventories
 3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories Inventories
The components of inventories are as follows:
 
March 31,
 
December 31,
 
2018
 
2017
 
(in thousands)
Work-in-process
$
26,869

 
$
22,579

Finished goods
25,209

 
27,247

Total
52,078

 
49,826

Less: Inventories - current
(13,377
)
 
(15,886
)
Inventories - non-current
$
38,701

 
$
33,940

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