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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, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 13,674	$ 18,620
Unrealized Gains	87	0
Unrealized Losses	0	0
Estimated Fair Value	13,761	18,620
Cash Equivalents [Member] | Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	8,672	18,620
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	8,672	$ 18,620
Short-term Investments [Member] | Treasury Bills [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	5,002
Unrealized Gains	87
Unrealized Losses	0
Estimated Fair Value	$ 5,089

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