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Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Total intangible assets, Gross Carrying Amount |  | $ 8,361 | $ 6,161
Total intangible assets, Accumulated Amortization |  | 4,778 | 4,419
Total intangible assets, Net |  | $ 3,583 | 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 |  | 227 | 211
Total intangible assets, Net |  | $ 45 | 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 |  | 4,325 | 4,115
Total intangible assets, Net |  | $ 1,471 | $ 1,681
NB-IoT technologies |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Total intangible assets, Weighted Average Amortization Period (Years) | [1] | 7 years |
Total intangible assets, Gross Carrying Amount | [1] | $ 2,200 |
Total intangible assets, Accumulated Amortization | [1] | 133 |
Total intangible assets, Net | [1] | $ 2,067 |
[1] | During the first quarter of 2018, the Company entered into an agreement to acquire certain NB-IoT technologies to be used in the Company's research and development activities in the amount of $2,800, of which $600 has not been received. Of the $2,200, $1,350 has not resulted in cash outflows as of March 31, 2018.

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