Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets Related to Accumulated Amortization and Goodwill (Detail)

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Intangible Assets Related to Accumulated Amortization and Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Intangible Assets And Goodwill [Line Items]    
Intangible assets, gross $ 2,800 $ 2,800
Intangible assets, accumulated amortization (2,600) (2,500)
Intangible assets, Impairment      
Intangible assets, net 200 300
Useful life Indefinite life  
Goodwill, gross 2,926 2,926
Goodwill, net 2,926 2,926
Patents
    
Intangible Assets And Goodwill [Line Items]    
Intangible assets, gross 1,914 1,914
Intangible assets, accumulated amortization (1,891) (1,833)
Intangible assets, Impairment      
Intangible assets, net 23 81
Trademarks
    
Intangible Assets And Goodwill [Line Items]    
Useful life 6 years  
Intangible assets, gross 69 69
Intangible assets, accumulated amortization (69) (69)
Intangible assets, Impairment      
Intangible assets, net      
Other Intangible Assets
    
Intangible Assets And Goodwill [Line Items]    
Intangible assets, gross 817 817
Intangible assets, accumulated amortization (640) (598)
Intangible assets, Impairment      
Intangible assets, net $ 177 $ 219
Minimum | Patents
    
Intangible Assets And Goodwill [Line Items]    
Useful life 4 years  
Minimum | Other Intangible Assets
    
Intangible Assets And Goodwill [Line Items]    
Useful life 4 years  
Maximum | Patents
    
Intangible Assets And Goodwill [Line Items]    
Useful life 10 years  
Maximum | Other Intangible Assets
    
Intangible Assets And Goodwill [Line Items]    
Useful life 6 years