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Investments in Companies (Tables)
 6 Months Ended
Jun. 30, 2015
Investments in Companies [Abstract]  
Investments
The investments are summarized below (in thousands):
 
  Investment Balance as of    
Company
 
June 30,
2015
  
December 31,
2014
 
Accounting
Method
 
Ownership
Percentage
 
Beijing JiYa Semiconductor Material Co., Ltd.
 
$
3,331
  
$
3,331
 
Consolidated
  
46
%
Nanjing Jin Mei Gallium Co., Ltd.
  
592
   
592
 
Consolidated
  
83
%
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd.
  
1,346
   
1,346
 
Consolidated
  
70
%
  
$
5,269
  
$
5,269
      
              
Donghai County Dongfang High Purity Electronic Materials Co., Ltd.
 
$
1,652
  
$
1,723
 
Equity
  
46
%
Xilingol Tongli Germanium Co. Ltd.
  
5,556
   
5,351
 
Equity
  
25
%
Emeishan Jia Mei High Purity Metals Co., Ltd.
  
1,043
   
1,021
 
Equity
  
25
%
  
$
8,251
  
$
8,095
      
Summarized income information
The minority investment entities that are not consolidated are accounted for under the equity method and had the following summarized income information (in thousands) for the three and six months ended June 30, 2015 and 2014.
 
 
 
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
  
2015
  
2014
  
2015
  
2014
 
         
Net revenue
 
$
11,004
  
$
13,466
  
$
20,329
  
$
26,946
 
Gross profit
  
3,625
   
8,124
   
5,920
   
12,087
 
Operating income
  
2,292
   
3,424
   
3,343
   
6,088
 
Net income
  
1,784
   
2,607
   
2,741
   
4,726