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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair value of financial assets and liabilities
Total financial assets	$ 82,243	$ 96,163
Money market funds
Fair value of financial assets and liabilities
Total financial assets	6,648	59,302
Corporate debt securities
Fair value of financial assets and liabilities
Total financial assets	60,516	25,698
Marketable equity securities
Fair value of financial assets and liabilities
Total financial assets	5,082	11,163
United States government agency securities
Fair value of financial assets and liabilities
Total financial assets	9,997
Level 1
Fair value of financial assets and liabilities
Total financial assets	11,730	70,465
Level 1 | Money market funds
Fair value of financial assets and liabilities
Total financial assets	6,648	59,302
Level 1 | Marketable equity securities
Fair value of financial assets and liabilities
Total financial assets	5,082	11,163
Level 2
Fair value of financial assets and liabilities
Total financial assets	70,513	25,698
Level 2 | Corporate debt securities
Fair value of financial assets and liabilities
Total financial assets	60,516	$ 25,698
Level 2 | United States government agency securities
Fair value of financial assets and liabilities
Total financial assets	$ 9,997

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- Definition

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
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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