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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair value of financial assets and liabilities
Total financial assets	$ 71,179	$ 94,885
Money market funds
Fair value of financial assets and liabilities
Total financial assets	10,493	6,167
United States government agency securities
Fair value of financial assets and liabilities
Total financial assets	14,519	15,948
United States government agency securities | Short-term Investments
Fair value of financial assets and liabilities
Total financial assets	14,519	15,948
Corporate debt securities
Fair value of financial assets and liabilities
Total financial assets	46,167	72,770
Level 1
Fair value of financial assets and liabilities
Total financial assets	10,493	6,167
Level 1 | Money market funds
Fair value of financial assets and liabilities
Total financial assets	10,493	6,167
Level 2
Fair value of financial assets and liabilities
Total financial assets	60,686	88,718
Level 2 | United States government agency securities | Short-term Investments
Fair value of financial assets and liabilities
Total financial assets	14,519	15,948
Level 2 | Corporate debt securities
Fair value of financial assets and liabilities
Total financial assets	$ 46,167	$ 72,770

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

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- References

No definition available.

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