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Inventories (Tables)
 12 Months Ended
Dec. 31, 2014
Inventory Disclosure [Abstract]  
Components of inventory
The components of inventories consist of the following (in thousands):
 
December 31,
 
2013
 
2014
Purchased parts and materials
$
2,911

 
$
2,273

Finished goods
3,628

 
9,069

Total inventory
$
6,539

 
$
11,342