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Inventory (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventory consists of the following at September 30, 2017 (in thousands):
 
 
September 30,
2017
 
December 31,
2016
Raw materials
 
$
2,724

 
$
—

Work in process
 
273

 
—

Finished goods
 
77

 
—

Total inventories
 
$
3,074

 
$
—