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Intangible Assets (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Purchased intangible assets from acquisition    
Gross $ 42,520,000 $ 42,520,000
Accumulated Amortization (10,080,000) (9,856,000)
Accumulated Impairment (29,749,000) (29,749,000)
Net 2,691,000 2,915,000
Developed technologies [Member]
    
Purchased intangible assets from acquisition    
Gross 26,000,000 26,000,000
Accumulated Amortization (5,869,000) (5,786,000)
Accumulated Impairment (19,547,000) (19,547,000)
Net 584,000 667,000
Trade name [Member]
    
Purchased intangible assets from acquisition    
Gross 12,800,000 12,800,000
Accumulated Amortization (2,277,000) (2,147,000)
Accumulated Impairment (8,582,000) (8,582,000)
Net 1,941,000 2,071,000
Other [Member]
    
Purchased intangible assets from acquisition    
Gross 3,720,000 3,720,000
Accumulated Amortization (1,934,000) (1,923,000)
Accumulated Impairment (1,620,000) (1,620,000)
Net $ 166,000 $ 177,000