Quarterly report pursuant to Section 13 or 15(d)

Summary of Intangible Assets, Related Accumulated Amortization and Goodwill (Detail)

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Summary of Intangible Assets, Related Accumulated Amortization and Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Intangible Assets And Goodwill [Line Items]    
Intangible assets, gross $ 2,800 $ 2,800
Intangible assets, accumulated amortization (2,635) (2,617)
Intangible assets, Impairment      
Intangible assets, net 165 183
Indefinite lived intangible assets 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 (1,898) (1,895)
Intangible assets, Impairment      
Intangible assets, net 16 19
Patents | Minimum
    
Intangible Assets And Goodwill [Line Items]    
Finite lived intangible asset useful life 4 years  
Patents | Maximum
    
Intangible Assets And Goodwill [Line Items]    
Finite lived intangible asset useful life 10 years  
Trademarks
    
Intangible Assets And Goodwill [Line Items]    
Finite lived intangible asset useful life 6 years  
Intangible assets, gross 69 69
Intangible assets, accumulated amortization (69) (69)
Intangible assets, Impairment      
Other Intangible Assets
    
Intangible Assets And Goodwill [Line Items]    
Intangible assets, gross 817 817
Intangible assets, accumulated amortization (668) (653)
Intangible assets, Impairment      
Intangible assets, net $ 149 $ 164
Other Intangible Assets | Minimum
    
Intangible Assets And Goodwill [Line Items]    
Finite lived intangible asset useful life 4 years  
Other Intangible Assets | Maximum
    
Intangible Assets And Goodwill [Line Items]    
Finite lived intangible asset useful life 6 years