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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair value of financial assets and liabilities
Total financial assets	$ 50,771	$ 58,059
Money market funds
Fair value of financial assets and liabilities
Total financial assets	3,758	8,991
United States government agency securities
Fair value of financial assets and liabilities
Total financial assets	11,228	8,029
United States government agency securities | Short-term Investments
Fair value of financial assets and liabilities
Total financial assets	11,228	8,029
Corporate debt securities
Fair value of financial assets and liabilities
Total financial assets	35,785	37,087
Marketable equity securities
Fair value of financial assets and liabilities
Total financial assets		3,952
Level 1
Fair value of financial assets and liabilities
Total financial assets	3,758	12,943
Level 1 | Money market funds
Fair value of financial assets and liabilities
Total financial assets	3,758	8,991
Level 1 | Marketable equity securities
Fair value of financial assets and liabilities
Total financial assets		3,952
Level 2
Fair value of financial assets and liabilities
Total financial assets	47,013	45,116
Level 2 | United States government agency securities | Short-term Investments
Fair value of financial assets and liabilities
Total financial assets	11,228	8,029
Level 2 | Corporate debt securities
Fair value of financial assets and liabilities
Total financial assets	$ 35,785	$ 37,087

X

- 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=75030427&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=82897076&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=82896770&loc=d3e26610-111562

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