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Available for Sale Marketable Securities in Unrealized Position (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 18,137	$ 20,170
Less than 12 Months, Unrealized Loss	(21)	(46)
12 Months or Longer, Fair Value		5,528
12 Months or Longer, Unrealized Loss		(3)
Total, Fair Value	18,137	25,698
Total, Unrealized Loss	(21)	(49)
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	18,137	20,170
Less than 12 Months, Unrealized Loss	(21)	(46)
12 Months or Longer, Fair Value		5,528
12 Months or Longer, Unrealized Loss		(3)
Total, Fair Value	18,137	25,698
Total, Unrealized Loss	$ (21)	$ (49)

X

- Definition

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 twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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

+ References

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-Publisher FASB
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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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