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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair value of financial assets and liabilities
Total financial assets	$ 113,534	$ 59,592
Money market funds
Fair value of financial assets and liabilities
Total financial assets	7,360	8,860
United States government agency securities
Fair value of financial assets and liabilities
Total financial assets	33,727	15,561
United States government agency securities | Short-term Investments
Fair value of financial assets and liabilities
Total financial assets	33,727	15,561
Corporate debt securities
Fair value of financial assets and liabilities
Total financial assets	72,447	35,171
Level 1
Fair value of financial assets and liabilities
Total financial assets	7,360	8,860
Level 1 | Money market funds
Fair value of financial assets and liabilities
Total financial assets	7,360	8,860
Level 2
Fair value of financial assets and liabilities
Total financial assets	106,174	50,732
Level 2 | United States government agency securities | Short-term Investments
Fair value of financial assets and liabilities
Total financial assets	33,727	15,561
Level 2 | Corporate debt securities
Fair value of financial assets and liabilities
Total financial assets	$ 72,447	$ 35,171

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- 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 942
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

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