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Goodwill and Intangible Assets Net - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]        
Dispose, impair or recognition of additional goodwill $ 0   $ 0  
Impairment charges on goodwill     0  
Amortization of intangible assets 51,000 $ 51,000 101,000 $ 101,000
Impairment losses recognized related to the acquired intangible assets 0 $ 0 0 $ 0
Annual amortization expense of the intangible assets, 2015 (remaining six months) 100,000   100,000  
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