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Financial Income, Net (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Interest income $ 3,300 $ 2,845 $ 2,824
Gain (loss) on available-for-sale marketable securities, net (9) (78) 6
Amortization of premium on available-for-sale marketable securities, net (1,064) (1,111) (1,121)
Foreign exchange loss, net (188) (490) (565)
Accretion of Contingent Consideration   (97) (169)
Financial income, net $ 2,039 $ 1,069 $ 975