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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]        
Recorded impairment charge $ 2,012,000   $ 2,012,000  
Patent renewal fees   38,000 55,000  
Amortization expense   264,000 314,000 325,000
Patents [Member]
        
Finite-Lived Intangible Assets [Line Items]        
Future amortization expense from patent assets held for 2014   169,000    
Future amortization expense from patent assets held for 2015   141,000    
Future amortization expense from patent assets held for 2016   128,000    
Future amortization expense from patent assets held for 2017   122,000    
Future amortization expense from patent assets held for 2018   $ 106,000