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Investments and Fair Value Instruments - Summary of Amortized Cost and Fair Value of Investment Securities Portfolio (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 5,293	$ 9,948
Unrealized Gains	117	101
Unrealized Losses	0	0
Estimated Fair Value	5,410	10,049
Cash Equivalents [Member] | Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,770	4,925
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	2,770	4,925
Short-term Investments [Member] | Treasury Bills [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,523	5,023
Unrealized Gains	117	101
Unrealized Losses	0	0
Estimated Fair Value	$ 2,640	$ 5,124

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