Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair value of financial assets and liabilities
Total short-term investments	$ 59,267	$ 81,041
Investment, Type [Extensible Enumeration]	us-gaap:ShortTermInvestmentsMember	us-gaap:ShortTermInvestmentsMember
Money market funds
Fair value of financial assets and liabilities
Total short-term investments	$ 5,062	$ 14,472
United States government agency securities
Fair value of financial assets and liabilities
Total short-term investments	$ 19,354	$ 26,423
Investment, Type [Extensible Enumeration]	us-gaap:ShortTermInvestmentsMember	us-gaap:ShortTermInvestmentsMember
Corporate debt securities
Fair value of financial assets and liabilities
Total short-term investments	$ 31,760	$ 36,795
Investment, Type [Extensible Enumeration]	us-gaap:ShortTermInvestmentsMember	us-gaap:ShortTermInvestmentsMember
Mortgage-backed securities
Fair value of financial assets and liabilities
Total short-term investments	$ 3,091	$ 3,351
Investment, Type [Extensible Enumeration]	us-gaap:ShortTermInvestmentsMember	us-gaap:ShortTermInvestmentsMember
Level 1
Fair value of financial assets and liabilities
Total short-term investments	$ 5,062	$ 14,472
Investment, Type [Extensible Enumeration]	us-gaap:ShortTermInvestmentsMember	us-gaap:ShortTermInvestmentsMember
Level 1 | Money market funds
Fair value of financial assets and liabilities
Total short-term investments	$ 5,062	$ 14,472
Level 2
Fair value of financial assets and liabilities
Total short-term investments	54,205	$ 66,569
Investment, Type [Extensible Enumeration]		us-gaap:ShortTermInvestmentsMember
Level 2 | United States government agency securities
Fair value of financial assets and liabilities
Total short-term investments	$ 19,354	$ 26,423
Investment, Type [Extensible Enumeration]	us-gaap:ShortTermInvestmentsMember	us-gaap:ShortTermInvestmentsMember
Level 2 | Corporate debt securities
Fair value of financial assets and liabilities
Total short-term investments	$ 31,760	$ 36,795
Investment, Type [Extensible Enumeration]	us-gaap:ShortTermInvestmentsMember	us-gaap:ShortTermInvestmentsMember
Level 2 | Mortgage-backed securities
Fair value of financial assets and liabilities
Total short-term investments	$ 3,091	$ 3,351
Investment, Type [Extensible Enumeration]	us-gaap:ShortTermInvestmentsMember	us-gaap:ShortTermInvestmentsMember
Level 3
Fair value of financial assets and liabilities
Investment, Type [Extensible Enumeration]	us-gaap:ShortTermInvestmentsMember