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Inventory (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventory, Net
Inventory consists of the following (in thousands):
 
June 30, 2017
 
December 31, 2016
Raw materials
$
2,232

 
$
4,397

Work in process
—

 
2,650

Total
$
2,232

 
$
7,047