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Goodwill and Intangible Assets Net - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Aug. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]          
Dispose, impair or recognition of additional goodwill   $ 0   $ 0  
Impairment charges on goodwill $ 0     0  
Amortization of intangible assets   50,000 $ 50,000 151,000 $ 151,000
Impairment losses recognized related to the acquired intangible assets   0 $ 0 0 $ 0
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  
Maximum          
Acquired Finite-Lived Intangible Assets [Line Items]          
Annual amortization expense of the intangible assets, 2015 (remaining three months)   $ 100,000   $ 100,000