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Summary of Intangible Assets (Parenthetical) (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangible assets, gross $ 8,361 $ 6,161
Intangible assets purchases incurred but unpaid at period end 750  
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  
Intangible assets purchases incurred but unpaid at period end $ 750  
[1] During the first quarter of 2018, the Company entered into an agreement to acquire certain NB-IoT technologies in the amount of $2,800, of which $600 has not been received. Of the $2,200, $750 has not resulted in cash outflows as of June 30, 2018. The Company recorded the amortization cost of the NB-IoT technologies in "cost of revenues" on the Company's interim condensed consolidated statements of income.