Summary of Available-for-Sale Securities (Detail) - USD ($)	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 63,485,000	$ 62,260,000
Gross Unrealized Gain	90,000	107,000
Gross Unrealized Loss	(272,000)	(408,000)
Allowance for Credit Loss	0	0	$ 0
Fair Value	63,303,000	61,959,000
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,269,000	1,773,000
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Allowance for Credit Loss	0	0
Fair Value	1,269,000	1,773,000
United States government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,783,000	24,060,000
Gross Unrealized Gain	34,000	54,000
Gross Unrealized Loss	(7,000)	(52,000)
Allowance for Credit Loss	0	0
Fair Value	23,810,000	24,062,000
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	35,504,000	33,357,000
Gross Unrealized Gain	54,000	53,000
Gross Unrealized Loss	(9,000)	(39,000)
Allowance for Credit Loss	0	0
Fair Value	35,549,000	33,371,000
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,929,000	3,070,000
Gross Unrealized Gain	2,000	0
Gross Unrealized Loss	(256,000)	(317,000)
Allowance for Credit Loss	0	0
Fair Value	$ 2,675,000	$ 2,753,000