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Other Income (Expense), Net - Schedule of Other Income (Expense), Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Income:      
Interest income $ 1,369 $ 701 $ 163
Foreign currency forward contract gains, net 9 0 0
Foreign currency exchange gains, net 209 5 8
Total other income 1,587 706 171
Other Expense:      
Skyfence holdback liability accretion (6) (212) (186)
Foreign currency exchange losses, net (708) (322) 0
Bank charges and Other expenses (950) (574) (205)
Total other expense (1,664) (1,108) (391)
Total other income (expense), net $ (77) $ (402) $ (220)