Summary of Available-for-Sale Securities (Detail) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 62,260,000	$ 60,456,000
Gross Unrealized Gain	107,000	26,000
Gross Unrealized Loss	(408,000)	(1,215,000)
Allowance for Credit Loss	0	0	$ 0
Fair Value	61,959,000	59,267,000
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,773,000	5,062,000
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Allowance for Credit Loss	0	0
Fair Value	1,773,000	5,062,000
United States government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,060,000	19,652,000
Gross Unrealized Gain	54,000	16,000
Gross Unrealized Loss	(52,000)	(314,000)
Allowance for Credit Loss	0	0
Fair Value	24,062,000	19,354,000
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	33,357,000	32,395,000
Gross Unrealized Gain	53,000	3,000
Gross Unrealized Loss	(39,000)	(638,000)
Allowance for Credit Loss	0	0
Fair Value	33,371,000	31,760,000
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,070,000	3,347,000
Gross Unrealized Gain	0	7,000
Gross Unrealized Loss	(317,000)	(263,000)
Allowance for Credit Loss	0	0
Fair Value	$ 2,753,000	$ 3,091,000