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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Schedule Of Goodwill And Other Intangible Asset [Line Items]      
Amortization expenses of intangible assets, 2016 $ 482    
Amortization expenses of intangible assets, 2017 473    
Amortization expenses of intangible assets, 2018 448    
Amortization expenses of intangible assets, 2019 447    
Amortization expenses of intangible assets, 2020 223    
Amortization expenses of intangible assets, After 2020 444    
Increase (decrease) in goodwill     $ 668
Deferred Tax Assets [Member]      
Schedule Of Goodwill And Other Intangible Asset [Line Items]      
Increase (decrease) in goodwill $ 500 $ 500 (500)
Digiplex [Member]      
Schedule Of Goodwill And Other Intangible Asset [Line Items]      
Increase (decrease) in goodwill   $ 500 468
Digiplex [Member] | Deferred Tax Assets [Member]      
Schedule Of Goodwill And Other Intangible Asset [Line Items]      
Increase (decrease) in goodwill     $ 600