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Concentration of Risk, Segment and Geographic Information (Tables)
 12 Months Ended
Dec. 31, 2014
Concentration of Risk, Segment and Geographic Information [Abstract]  
Revenue by geographical region
Revenue attributed to the following geographic regions for each of the three years ended December 31, 2014, 2013 and 2012 was as follows (in thousands):

  
Year ended December 31,
 
  
2014
  
2013
  
2012
 
United States
 
$
11,756
  
$
19,955
  
$
14,134
 
Europe
  
5,510
   
15,396
   
18,454
 
Asia Pacific
  
1,600
   
100
   
1,194
 
Total
 
$
18,866
  
$
35,451
  
$
33,782