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Goodwill and Intangible Assets Net - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]    
Disposal or recognition of additional goodwill $ 0  
Impairment charges on goodwill 0  
Amortization of intangible assets 50,000 50,000
Impairment charges recognized related to the acquired intangible assets 0 0
Annual amortization expense of the intangible assets, 2014 (remaining nine months) 150,000  
Annual amortization expense of the intangible assets, 2015 200,000  
Annual amortization expense of the intangible assets, 2016 200,000  
Annual amortization expense of the intangible assets, 2017 200,000  
Annual amortization expense of the intangible assets, 2018 200,000  
Annual amortization expense of the intangible assets, 2019 200,000  
Annual amortization expense of the intangible assets, 2020 $ 100,000