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Intangible Assets (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Purchased intangible assets from acquisition      
Gross $ 42,520,000 $ 42,520,000  
Accumulated Amortization (9,856,000) (7,159,000)  
Impairment loss on equipment and software license intangible assets (100,000) (203,000) (167,000)
Net 2,915,000 35,361,000  
Developed technologies [Member]
      
Purchased intangible assets from acquisition      
Gross 26,000,000 26,000,000  
Accumulated Amortization (5,786,000) (4,163,000)  
Impairment loss on equipment and software license intangible assets (19,547,000)    
Net 667,000 21,837,000  
Trade name [Member]
      
Purchased intangible assets from acquisition      
Gross 12,800,000 12,800,000  
Accumulated Amortization (2,147,000) (1,387,000)  
Impairment loss on equipment and software license intangible assets (8,582,000)    
Net 2,071,000 11,413,000  
Other [Member]
      
Purchased intangible assets from acquisition      
Gross 3,720,000 3,720,000  
Accumulated Amortization (1,923,000) (1,609,000)  
Impairment loss on equipment and software license intangible assets (1,620,000)    
Net $ 177,000 $ 2,111,000