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Inventories
9 Months Ended
Sep. 30, 2013
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consisted of the following (in thousands):
 
September 30,
2013
 
December 31,
2012
Finished goods and demonstration equipment
$
1,743

 
$
2,677

Purchased parts and subassemblies
2,807

 
3,359

Total inventories
$
4,550

 
$
6,036