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The Company and Summary of Significant Accounting Policies (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
The Company and Summary of Significant Accounting Policies [Abstract]      
Percentage of pure gallium products produces by joint ventures (in hundredths) 99.99%    
Schedule of Equity Method Investments [Line Items]      
Reclassified from other income (expense) to equity in earnings $ 1,281,000 $ 741,000 $ 259,000
Accounts Receivable and Allowance for Doubtful Accounts and Sales Returns [Line Items]      
Minimum period to evaluate receivable from US customer 90 days    
Minimum period to evaluate receivable from other than US customer 120 days    
Accounts receivable, net 17,912,000 17,966,000 23,100,000
Valuation allowance balance     856,000
Warranty Reserve [Abstract]      
Accrued product warranties 588,000 1,003,000 740,000
Impairment of Long Lived Assets [Abstract]      
Impairment of long-lived assets 0 0 0
Segment Reporting [Abstract]      
Number of operating segments 1    
Advertising Costs [Abstract]      
Advertising costs 19,000 16,000 83,000
Computers and Software [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated economic life 3 years    
Office Equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated economic life 3 years    
Furniture and Fixtures [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated economic life 3 years    
Automobiles [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated economic life 5 years    
Leasehold and Building Improvements [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated economic life 10 years    
Building [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated economic life 27 years 6 months    
Allowance for Doubtful Accounts [Member]
      
Accounts Receivable and Allowance for Doubtful Accounts and Sales Returns [Line Items]      
Allowance deductions   99,000 64,000
Allowance for Sales Returns [Member]
      
Accounts Receivable and Allowance for Doubtful Accounts and Sales Returns [Line Items]      
Allowance deductions 426,000 144,000 518,000
Additional allowance for sales return 547,000 (194,000) 124,000
Valuation allowance balance $ 245,000 $ 124,000 $ 462,000
Major Customer One [Member]
      
Revenue, Major Customer [Line Items]      
Number of customers representing significant revenue 1 1  
Percentage of revenue generated by major customers (in hundredths) 17.00% 18.00% 19.00%
Number of customers who accounted for 10% or more share in trade accounts receivable 1    
Percentage of trade accounts receivable accounted by major customer (in hundredths) 28.00% 33.00%  
Major Customer Two [Member]
      
Revenue, Major Customer [Line Items]      
Number of customers representing significant revenue 1 1  
Top Five Major Customers [Member]
      
Revenue, Major Customer [Line Items]      
Number of customers representing significant revenue 5 5 5
Percentage of revenue generated by major customers (in hundredths) 37.00% 35.00% 40.00%
Minimum [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated economic life 3 years    
Minimum [Member] | Joint Ventures [Member]
      
Schedule of Equity Method Investments [Line Items]      
Percentage of ownership, equity method (in hundredths) 20.00%    
Minimum [Member] | Majority-owned Subsidiaries [Member]
      
Schedule of Equity Method Investments [Line Items]      
Percentage of ownership, equity method (in hundredths) 20.00%    
Maximum [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated economic life 27 years 6 months    
Maximum [Member] | Joint Ventures [Member]
      
Schedule of Equity Method Investments [Line Items]      
Percentage of ownership, equity method (in hundredths) 83.00%    
Maximum [Member] | Majority-owned Subsidiaries [Member]
      
Schedule of Equity Method Investments [Line Items]      
Percentage of ownership, equity method (in hundredths) 50.00%