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Segment Information and Foreign Operations
 6 Months Ended
Jun. 30, 2012
Segment Information and Foreign Operations [Abstract]  
Segment Information and Foreign Operations
Note 9. 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 the principal 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.

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

Three Months Ended
Six Months Ended
June 30,
June 30,
2012
2011
2012
2011
Revenue by product type:
GaAs substrates
$
14,862
$
17,966
$
27,093
$
33,858
InP substrates
1,333
1,604
2,784
2,936
Ge substrates
2,441
2,701
5,071
5,691
Raw materials and other
6,517
7,760
13,691
12,112
Total
$
25,153
$
30,031
$
48,639
$
54,597

Geographical Information

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
2012
2011
2012
2011
Revenue by geographic region:
North America*
$
4,266
$
6,412
$
9,433
$
10,204
Europe
4,806
6,048
9,371
11,232
Japan
2,603
4,379
4,792
7,407
Taiwan
3,594
2,745
5,640
5,609
Asia Pacific
9,884
10,447
19,403
20,145
Total
$
25,153
$
30,031
$
48,639
$
54,597

[Missing Graphic Reference]
*Primarily the United States

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,
2012
2011
Long-lived assets by geographic region:
North America
$
375
$
484
China
34,941
33,798
$
35,316
$
34,282

Significant Customers

One customer represented 15.1% of our revenue for the three months ended June 30, 2012 while one customer represented 19.0% of our revenue for the three months ended June 30, 2011. One customer represented 16.2% of our revenue for the six months ended June 30, 2012 and one customer represented 17.6% of our revenue for the six months ended June 30, 2011. Our top five customers represented 39.3% and 36.9% of our revenue for the three months ended June 30, 2012 and 2011, respectively. Our top five customers represented 39.1% and 36.5% of our revenue for the six months ended June 30, 2012 and 2011, 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 10% or more of our trade accounts receivable balance as of June 30, 2012 at 32.2%. One customer accounted for 10% or more of our trade accounts receivable balance as of December 31, 2011 at 32.4%.