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Components of Accumulated Other Comprehensive Income (Loss) (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance $ (4,250)
Other comprehensive income (loss) before reclassifications (2,634)
Amounts reclassified from accumulated other comprehensive income (2,366)
Net current-period other comprehensive income (loss) (5,000)
Ending balance (9,250)
Unrealized gains (losses) on marketable securities  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (4,259)
Other comprehensive income (loss) before reclassifications (2,793)
Amounts reclassified from accumulated other comprehensive income (2,265) [1]
Net current-period other comprehensive income (loss) (5,058)
Ending balance (9,317)
Unrealized gains (losses) on cash flow hedges  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance 9
Other comprehensive income (loss) before reclassifications 159
Amounts reclassified from accumulated other comprehensive income (101) [1],[2]
Net current-period other comprehensive income (loss) 58
Ending balance $ 67
[1] The reclassification out of accumulated other comprehensive income during the year ended December 31, 2016 for realized gains on marketable securities are included within financial income, net.
[2] The reclassification out of accumulated other comprehensive income during the year ended December 31, 2016 for realized gains on cash flow hedges are included mostly within research and development expenses as well as other operating expenses.