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Inventories (Tables)
 9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Components of Inventory The components of inventories are as follows:
 
September 30,
2018
 
December 31,
2017
 
(in thousands)
Work-in-process
$
26,127

 
$
22,579

Finished goods
24,951

 
27,247

Total
51,078

 
49,826

Less: Inventories - current
(19,120
)
 
(15,886
)
Inventories - non-current
$
31,958

 
$
33,940