Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair value of financial assets and liabilities
Total short-term investments	$ 61,629	$ 59,267
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	$ 7,639	$ 5,062
United States government agency securities
Fair value of financial assets and liabilities
Total short-term investments	23,902	$ 19,354
Investment, Type [Extensible Enumeration]		Short-Term Investments [Member]
Corporate debt securities
Fair value of financial assets and liabilities
Total short-term investments	$ 27,129	$ 31,760
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	$ 2,959	$ 3,091
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	$ 7,639	$ 5,062
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	$ 7,639	$ 5,062
Level 2
Fair value of financial assets and liabilities
Total short-term investments	$ 53,990	$ 54,205
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	$ 23,902	$ 19,354
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	$ 27,129	$ 31,760
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	$ 2,959	$ 3,091
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]