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Segment Information and Foreign Operations
 3 Months Ended
Mar. 31, 2015
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 our condensed consolidated financial statements.
 
The following table represents revenue amounts (in thousands) reported for products shipped to customers in the corresponding geographic region:

  
ThreeMonthsEnded
March31,
 
  
2015
  
2014
 
Geographical information:
    
Europe (primarily Germany)
 
$
4,943
  
$
6,583
 
China
  
3,297
   
4,165
 
Asia Pacific (excluding China, Japan and Taiwan)
  
2,759
   
2,389
 
Taiwan
  
3,109
   
2,115
 
Japan
  
2,484
   
2,313
 
North America (primarily the United States)
  
3,472
   
1,780
 
Total
 
$
20,064
  
$
19,345
 

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):

  
Asof
 
  
March31,
2015
  
December31,
2014
 
Long-lived assets by geographic region:
    
United States of America
 
$
403
  
$
136
 
China
  
32,820
   
33,726
 
  
$
33,223
  
$
33,862
 

Significant Customers

No customer represented more than 10% of our revenue for the three months ended March 31, 2015 and 2014. Our top five customers, although not the same five customers for each period, represented 35% and 39% of our revenue for the three months ended March 31, 2015 and 2014, 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. No customer accounted for over 10% of our accounts receivable balance as of March 31, 2015 while two customers accounted for 11% and 10% of our accounts receivable balance as of December 31, 2014.