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Segment Information and Foreign Operations
 6 Months Ended
Jun. 30, 2013
Segment Information and Foreign Operations [Abstract]  
Segment Information and Foreign Operations
 
Note 11. 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,
 
 
 
2013
  
2012
  
2013
  
2012
 
Product type:
 
  
  
  
 
GaAs substrates
 
$
10,642
  
$
14,862
  
$
22,365
  
$
27,093
 
InP substrates
  
2,017
   
1,333
   
3,866
   
2,784
 
Ge substrates
  
5,347
   
2,441
   
7,898
   
5,071
 
Raw materials and other
  
5,825
   
6,517
   
12,082
   
13,691
 
Total
 
$
23,831
  
$
25,153
  
$
46,211
  
$
48,639
 

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
 
 
 
2013
  
2012
  
2013
  
2012
 
Geographical region:
 
  
  
  
 
China
 
$
7,704
  
$
6,195
  
$
13,733
  
$
11,969
 
Europe (primarily Germany)
  
5,622
   
4,806
   
10,311
   
9,371
 
Taiwan
  
3,159
   
3,594
   
6,938
   
5,640
 
North America (primarily the United States)
  
2,043
   
4,266
   
5,512
   
9,433
 
Japan
  
3,020
   
2,603
   
5,302
   
4,792
 
Asia Pacific (excluding China, Taiwan and Japan)
  
2,283
   
3,689
   
4,415
   
7,434
 
Total
 
$
23,831
  
$
25,153
  
$
46,211
  
$
48,639
 

 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,
 
 
 
2013
  
2012
 
 
 
  
 
North America
 
$
312
  
$
430
 
China
  
36,989
   
36,805
 
 
 
$
37,301
  
$
37,235
 

Significant Customers

No customer represented more than 10% of our revenue for the three months ended June 30, 2013 while one customer represented 15% of our revenue for the three months ended June 30, 2012. No customer represented more than 10% of our revenue for the six months ended June 30, 2013 while one customer represented 16% of our revenue for the six months ended June 30, 2012. Our top five customers, although not the same five customers for each period, represented 32% and 39% of our revenue for the three months ended June 30, 2013 and 2012, respectively. Our top five customers, although not the same five customers for each period, represented 30% and 39% of our revenue for the six months ended June 30, 2013 and 2012, 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 12% and 28% of our trade accounts receivable balance as of June 30, 2013 and December 31, 2012, respectively.