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Components of Accumulated Other Comprehensive Income (Loss) (Detail)
$ in Thousands

12 Months Ended

Dec. 31, 2018

USD ($)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

$ (15,634)

Other comprehensive loss before reclassifications

(14,331)

Amounts reclassified from accumulated other comprehensive income

5,468

Net current-period other comprehensive loss

(8,863)

Ending balance

(24,497)

Unrealized gains (losses) on marketable securities

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

(15,719)

Other comprehensive loss before reclassifications

(9,757)

Amounts reclassified from accumulated other comprehensive income

1,387

^[1]

Net current-period other comprehensive loss

(8,370)

Ending balance

(24,089)

Unrealized gains (losses) on cash flow hedges

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

85

Other comprehensive loss before reclassifications

(4,574)

Amounts reclassified from accumulated other comprehensive income

4,081

^[2]

Net current-period other comprehensive loss

(493)

Ending balance

$ (408)

[1]	The reclassification out of accumulated other comprehensive income during the year ended December 31, 2018 for realized losses on marketable securities are included within financial income, net.
[2]	The reclassification out of accumulated other comprehensive income during the year ended December 31, 2018 for realized gains on cash flow hedges are included mostly within research and development expenses as well as other operating expenses.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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