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Acquisitions - Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2015 $ 186  
2016 372  
2017 372  
2018 372  
2019 372  
2020 372  
Thereafter 1,976  
Total 4,022 $ 4,212
Path Logic [Member]    
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2015 74  
2016 148  
2017 148  
2018 148  
2019 148  
2020 148  
Thereafter 970  
Total $ 1,784