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Goodwill and Intangible Assets Net - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]          
Disposal or recognition of additional goodwill $ 0   $ 0    
Impairment charges on goodwill 0   0    
Goodwill balance 1,316,000   1,316,000   1,316,000
Amortization expenses of intangible assets 51,000 51,000 101,000 101,000  
Impairment charges recognized related to the acquired intangible assets 0 0 0 0  
Annual amortization expense of the intangible assets, 2013 (remaining six months) 100,000   100,000    
Annual amortization expense of the intangible assets, 2014 200,000   200,000    
Annual amortization expense of the intangible assets, 2015 200,000   200,000    
Annual amortization expense of the intangible assets, 2016 200,000   200,000    
Annual amortization expense of the intangible assets, 2017 200,000   200,000    
Annual amortization expense of the intangible assets, 2018 200,000   200,000    
Annual amortization expense of the intangible assets, 2019 200,000   200,000    
Annual amortization expense of the intangible assets, 2020 $ 100,000   $ 100,000