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Intangible Assets - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Patent renewal fees $ 64,000 $ 25,000  
Amortization expense 145,000 $ 170,000 $ 264,000
Patents [Member]      
Finite-Lived Intangible Assets [Line Items]      
Future amortization expense from patent assets held for 2016 133,000    
Future amortization expense from patent assets held for 2017 127,000    
Future amortization expense from patent assets held for 2018 111,000    
Future amortization expense from patent assets held for 2019 105,000    
Future amortization expense from patent assets held for 2020 $ 100,000