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Summary of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 77,109	$ 85,049
Gross Unrealized Gain	5,155	11,163
Gross Unrealized (Loss)	(21)	(49)
Fair Value	82,243	96,163
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,648	59,302
Fair Value	6,648	59,302
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	60,465	25,747
Gross Unrealized Gain	72
Gross Unrealized (Loss)	(21)	(49)
Fair Value	60,516	25,698
Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Gain	5,082	11,163
Fair Value	5,082	$ 11,163
United States government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,996
Gross Unrealized Gain	1
Fair Value	$ 9,997

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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