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Available-for-Sale Marketable Securities in Unrealized Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 96,121	$ 44,514
Less than 12 Months, Unrealized Loss	(417)	(97)
Total, Fair Value	96,121	44,514
Total, Unrealized Loss	(417)	(97)
United States government agency securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	15,402	8,729
Less than 12 Months, Unrealized Loss	(42)	(24)
Total, Fair Value	15,402	8,729
Total, Unrealized Loss	(42)	(24)
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	80,719	35,785
Less than 12 Months, Unrealized Loss	(375)	(73)
Total, Fair Value	80,719	35,785
Total, Unrealized Loss	$ (375)	$ (73)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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+ References

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

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