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Segment Information and Foreign Operations
 6 Months Ended
Jun. 30, 2014
Segment Information and Foreign Operations [Abstract]  
Segment Information and Foreign Operations
Note 10. Segment Information and Foreign Operations

Segment Information

We operate in one segment for the design, development, manufacture and distribution of high-performance compound semiconductor substrates and sale of materials. In accordance with ASC topic 280, Segment Reporting, our chief operating decision-maker has been identified as our Chief Executive Officer, who reviews operating results to make decisions about allocating resources and assessing performance for the Company. Since we operate in one segment, all financial segment and product line information can be found in the condensed consolidated financial statements.

The following table represents revenue amounts (in thousands) by product type:

 
 
Three Months Ended
  
Six Months Ended
 
 
 
June 30,
  
June 30,
 
 
 
2014
  
2013
  
2014
  
2012
 
Product type:
 
  
  
  
 
GaAs substrates
 
$
11,364
  
$
10,642
  
$
19,852
  
$
22,365
 
InP substrates
  
3,000
   
2,017
   
5,180
   
3,866
 
Ge substrates
  
1,681
   
5,347
   
4,959
   
7,898
 
Raw materials and other
  
5,404
   
5,825
   
10,803
   
12,082
 
Total
 
$
21,449
  
$
23,831
  
$
40,794
  
$
46,211
 
 
The following table represents revenue amounts (in thousands) reported for products shipped to customers in the corresponding geographic region:

 
 
Three Months Ended
  
Six Months Ended
 
 
 
June 30,
  
June 30
 
 
 
2014
  
2013
  
2014
  
2013
 
Geographical region:
 
  
  
  
 
Europe (primarily Germany)
 
$
4,968
  
$
5,622
  
$
11,551
  
$
10,311
 
China
  
4,960
   
7,704
   
9,125
   
13,733
 
Japan
  
3,457
   
3,020
   
5,770
   
5,302
 
North America (primarily the United States)
  
2,829
   
2,043
   
4,609
   
5,512
 
Taiwan
  
2,785
   
3,159
   
4,900
   
6,938
 
Asia Pacific (excluding China, Taiwan and Japan)
  
2,450
   
2,283
   
4,839
   
4,415
 
Total
 
$
21,449
  
$
23,831
  
$
40,794
  
$
46,211
 

 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,
  
December 31,
 
 
 
2014
  
2013
 
Long-lived assets by geographic region:
 
  
 
North America
 
$
271
  
$
204
 
China
  
34,955
   
37,417
 
 
 
$
35,226
  
$
37,621
 

Significant Customers

No customer represented more than 10% of our revenue for the three months ended June 30, 2014 and 2013. No customer represented more than 10% of our revenue for the six months ended June 30, 2014 and 2013. Our top five customers, although not the same five customers for each period, represented 36% and 32% of our revenue for the three months ended June 30, 2014 and 2013, respectively. Our top five customers, although not the same five customers for each period, represented 35% and 30% of our revenue for the six months ended June 30, 2014 and 2013, respectively.

We perform ongoing credit evaluations of our customers’ financial condition, and limit the amount of credit extended when deemed necessary, but generally do not require collateral. One customer accounted for over 10% of our trade accounts receivable balance as of June 30, 2014 while one customer accounted for 20% of our trade accounts receivable balance as of December 31, 2013.