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Inventories
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consisted of the following (in thousands): 
 
June 30,
2017
 
December 31,
2016
Raw materials
$
2,591

 
$
1,547

Work in process
15,689

 
18,689

Finished goods
21,378

 
13,815

Total inventories
$
39,658

 
$
34,051