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Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets, Gross Carrying Amount $ 6,161 $ 6,161
Total intangible assets, Accumulated Amortization 1,947 3,183
Total intangible assets, Net $ 4,214 2,978
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets, Weighted Average Amortization Period (Years) 4 years 6 months  
Total intangible assets, Gross Carrying Amount $ 272 272
Total intangible assets, Accumulated Amortization 91 151
Total intangible assets, Net $ 181 121
Customer backlog    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets, Weighted Average Amortization Period (Years) 1 year 6 months  
Total intangible assets, Gross Carrying Amount $ 93 93
Total intangible assets, Accumulated Amortization $ 93 93
Core technologies    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets, Weighted Average Amortization Period (Years) 5 years 1 month 6 days  
Total intangible assets, Gross Carrying Amount $ 5,796 5,796
Total intangible assets, Accumulated Amortization 1,763 2,939
Total intangible assets, Net $ 4,033 $ 2,857