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Segment Information and Foreign Operations (Tables)
6 Months Ended
Jun. 30, 2015
Segment Information and Foreign Operations [Abstract]  
Revenue reported for products shipped to customers in the corresponding geographic region
The following table represents revenue amounts (in thousands) reported for products shipped to customers in the corresponding geographic region:
 
  
Three Months Ended
June 30,
  
Six Months Ended
June 30
 
  
2015
  
2014
  
2015
  
2014
 
Geographical region:
        
Europe (primarily Germany)
 
$
5,664
  
$
4,968
  
$
10,607
  
$
11,551
 
China
  
3,561
   
4,960
   
6,858
   
9,125
 
Taiwan
  
3,414
   
2,785
   
6,523
   
4,900
 
North America (primarily the United States)
  
2,850
   
2,829
   
6,322
   
4,609
 
Asia Pacific (excluding China, Taiwan and Japan)
  
2,768
   
2,450
   
5,527
   
4,839
 
Japan
  
2,753
   
3,457
   
5,237
   
5,770
 
Total
 
$
21,010
  
$
21,449
  
$
41,074
  
$
40,794
 
Long-lived assets by geographic region
Long-lived assets consist primarily of property, plant and equipment, and are attributed to the geographic location in which they are located. Long-lived assets by geographic region were as follows (in thousands):
 
  
As of
 
  
June 30,
2015
  
December 31,
2014
 
Long-lived assets by geographic region:
    
North America
 
$
1,114
  
$
136
 
China
  
32,252
   
33,726
 
  
$
33,366
  
$
33,862