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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Fair value of financial assets and liabilities
Total short-term investments	$ 64,122	$ 61,959
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Money market funds
Fair value of financial assets and liabilities
Total short-term investments	$ 1,280	$ 1,773
United States government agency securities
Fair value of financial assets and liabilities
Total short-term investments	$ 23,916	$ 24,062
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Corporate debt securities
Fair value of financial assets and liabilities
Total short-term investments	$ 36,274	$ 33,371
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Mortgage-backed securities
Fair value of financial assets and liabilities
Total short-term investments	$ 2,652	$ 2,753
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Level 1
Fair value of financial assets and liabilities
Total short-term investments	$ 1,280	$ 1,773
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Level 1 | Money market funds
Fair value of financial assets and liabilities
Total short-term investments	$ 1,280	$ 1,773
Level 2
Fair value of financial assets and liabilities
Total short-term investments	$ 62,842	$ 60,186
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Level 2 | United States government agency securities
Fair value of financial assets and liabilities
Total short-term investments	$ 23,916	$ 24,062
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Level 2 | Corporate debt securities
Fair value of financial assets and liabilities
Total short-term investments	$ 36,274	$ 33,371
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Level 2 | Mortgage-backed securities
Fair value of financial assets and liabilities
Total short-term investments	$ 2,652	$ 2,753
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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