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Inventory (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventory consists of the following at December 31, 2017 (in thousands):
 
 
December 31, 2017
 
December 31, 2016
Raw materials
 
$
3,852

 
$
—

Work in process
 
313

 
—

Finished goods
 
201

 
—

Total inventories
 
$
4,366

 
$
—