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Goodwill and Intangible assets - Estimated Amortization Expense of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
2014 (remaining three months) $ 46  
2015 178  
2016 171  
2017 167  
2018 157  
2019 147  
Thereafter 726  
Amortized intangible assets, Net Carrying Amount $ 1,592 $ 1,401