Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Money market funds
Fair value of financial assets and liabilities
Total short-term investments	$ 7,845	$ 14,472
Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	74,921	81,041
United States government agency securities | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	26,668	26,423
Corporate debt securities | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	37,053	36,795
Mortgage-backed securities | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	3,355	3,351
Level 1 | Money market funds
Fair value of financial assets and liabilities
Total short-term investments	7,845	14,472
Level 1 | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	7,845	14,472
Level 2 | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	67,076	66,569
Level 2 | United States government agency securities | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	26,668	26,423
Level 2 | Corporate debt securities | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	37,053	36,795
Level 2 | Mortgage-backed securities | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	$ 3,355	$ 3,351