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Available-for-Sale Marketable Securities in Unrealized Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 75,761	$ 44,514
Less than 12 Months, Unrealized Loss	(253)	(97)
12 Months or Longer, Fair Value	10,975
12 Months or Longer, Unrealized Loss	(30)
Total, Fair Value	86,736	44,514
Total, Unrealized Loss	(283)	(97)
United States government agency securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	14,948	8,729
Less than 12 Months, Unrealized Loss	(22)	(24)
12 Months or Longer, Fair Value	999
12 Months or Longer, Unrealized Loss	(1)
Total, Fair Value	15,947	8,729
Total, Unrealized Loss	(23)	(24)
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	60,813	35,785
Less than 12 Months, Unrealized Loss	(231)	(73)
12 Months or Longer, Fair Value	9,976
12 Months or Longer, Unrealized Loss	(29)
Total, Fair Value	70,789	35,785
Total, Unrealized Loss	$ (260)	$ (73)

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer.

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+ References

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