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Details about Reclassification out of Accumulated Other Comprehensive Income Components (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Cost of revenues | $ (1,988) | $ (1,608) | $ (3,960) | $ (3,304)
Financial income (loss), net | 777 | 755 | 1,704 | 1,326
Research and development | (11,843) | (10,509) | (23,859) | (20,382)
Sales and marketing | (3,399) | (3,427) | (6,575) | (6,365)
General and administrative | (2,833) | (2,552) | (5,787) | (4,677)
Income (loss) before taxes on income | (1,884) | 2,925 | (3,865) | 7,842
Income tax expense (benefit) | 206 | (983) | 407 | (173)
Net income | (2,090) | 3,908 | (4,272) | 8,015
Reclassification out of accumulated other comprehensive income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income | (159) | 37 | (173) | 140
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on cash flow hedges |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Cost of revenues | (3) | 1 | (4) | 4
Research and development | (154) | 37 | (170) | 162
Sales and marketing | (6) | 2 | (7) | 10
General and administrative | (14) | 2 | (15) | 12
Income (loss) before taxes on income | (177) | 42 | (196) | 188
Income tax expense (benefit) | (19) | 4 | (21) | 19
Net income | (158) | 38 | (175) | 169
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on available-for-sale marketable securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Financial income (loss), net | (2) | (2) | 2 | (40)
Income tax expense (benefit) | (1) | (1) |  | (11)
Net income | $ (1) | $ (1) | $ 2 | $ (29)

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