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
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Intangible Assets And Goodwill [Line Items]    
Intangible assets, gross $ 2,800 $ 2,800
Intangible assets, accumulated amortization (2,652) (2,617)
Intangible assets, Impairment      
Intangible assets, net 148 183
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 (1,901) (1,895)
Intangible assets, Impairment      
Intangible assets, net 13 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 (682) (653)
Intangible assets, Impairment      
Intangible assets, net $ 135 $ 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