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Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets, Gross Carrying Amount | $ 6,161 | $ 6,161
Total intangible assets, Accumulated Amortization | 3,183 | 4,419
Total intangible assets, Net | $ 2,978 | 1,742
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 | 151 | 211
Total intangible assets, Net | $ 121 | 61
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 | 2,939 | 4,115
Total intangible assets, Net | $ 2,857 | $ 1,681

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