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Summary of Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite lived intangible assets, gross |  | $ 8,361 | $ 6,161
NB-IoT technologies |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, acquired |  | 2,800 |
Finite-lived intangible assets, balance not received |  | 600 |
Finite lived intangible assets, gross | [1] | 2,200 |
Capital expenditures incurred but not yet paid |  | $ 1,350 |
[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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