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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair value of financial assets and liabilities
Total financial assets	$ 94,885	$ 50,771
Money market funds
Fair value of financial assets and liabilities
Total financial assets	6,167	3,758
United States government agency securities
Fair value of financial assets and liabilities
Total financial assets	15,948	11,228
United States government agency securities | Short-term Investments
Fair value of financial assets and liabilities
Total financial assets	15,948	11,228
Corporate debt securities
Fair value of financial assets and liabilities
Total financial assets	72,770	35,785
Level 1
Fair value of financial assets and liabilities
Total financial assets	6,167	3,758
Level 1 | Money market funds
Fair value of financial assets and liabilities
Total financial assets	6,167	3,758
Level 2
Fair value of financial assets and liabilities
Total financial assets	88,718	47,013
Level 2 | United States government agency securities | Short-term Investments
Fair value of financial assets and liabilities
Total financial assets	15,948	11,228
Level 2 | Corporate debt securities
Fair value of financial assets and liabilities
Total financial assets	$ 72,770	$ 35,785

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 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

Reference 2: 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=82897076&loc=d3e27161-111563

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X

- References

No definition available.

+ Details

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