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Inventory (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventory consists of the following at June 30, 2017 (in thousands):
 
 
June 30,
2017
 
December 31,
2016
Raw materials
 
$
1,612

 
$
—

Work in process
 
—

 
—

Finished goods
 
24

 
—

Total inventories
 
$
1,636

 
$
—