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Inventory (Tables)
12 Months Ended
Dec. 31, 2014
Inventory Disclosure [Abstract]  
Inventory
Inventory consists of the following (in thousands): 
 
 
 
DECEMBER 31,
 
 
2013
 
2014
 
 
 
 
 
Raw materials
 
$
13

 
$
—

Finished goods
 
4

 
25

Total inventory
 
$
17

 
$
25