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Financial Income, Net (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Interest income $ 4,233 $ 3,300 $ 2,845
Loss on available-for-sale marketable securities, net   (9) (78)
Amortization of premium on available-for-sale marketable securities, net (1,179) (1,064) (1,111)
Foreign exchange loss, net (28) (188) (490)
Accretion of Contingent Consideration     (97)
Financial income, net $ 3,026 $ 2,039 $ 1,069