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Related Party Transactions (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Installment
Jun. 30, 2013
Jun. 30, 2014
Installment
Jun. 30, 2013
Dec. 31, 2013
Aug. 31, 2011
EquityMethodInvestee
Related Party Transaction [Line Items]            
Related party notes receivable - long term $ 1,703,000   $ 1,703,000   $ 1,715,000 [1]  
Accrued liabilities 7,122,000   7,122,000   7,286,000 [1]  
Accounts payable 6,612,000   6,612,000   8,140,000 [1]  
Area of leased property (in square feet) 27,760   27,760      
Lease term     7 years      
Beijing JiYa Semiconductor Material Co Ltd [Member]
           
Related Party Transaction [Line Items]            
Amount of loan under note agreement           1,700,000
Number of equity method investees to whom loan was granted           1
Term of Loan     2 years 10 months      
Number of installments 3   3      
Related party notes receivable - long term 1,700,000   1,700,000   1,700,000  
Income from agency sales 0 10,000 0 20,000    
Accrued liabilities 0   0   0  
Accounts payable 1,400,000   1,400,000   1,500,000  
Nanjing Jin Mei Gallium Co Ltd [Member]
           
Related Party Transaction [Line Items]            
Income from agency sales 10,000 28,000 16,000 93,000    
Beijing Tongmei Xtal Technology [Member]
           
Related Party Transaction [Line Items]            
Area of leased property (in square feet) 22,081   22,081      
Lease term     10 years      
Annual lease payment     24,000      
Increase in annual lease payment at each third year anniversary (in hundredths) 5.00%   5.00%      
Payments to purchase materials     $ 169,000      
[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 31, 2013