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Investments and Fair Value Instruments - Summary of Amortized Cost and Fair Value of Investment Securities Portfolio (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 6,853	$ 9,948
Unrealized Gains	161	101
Unrealized Losses	0	0
Estimated Fair Value	7,014	10,049
Cash Equivalents [Member] | Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,830	4,925
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	1,830	4,925
Short-term Investments [Member] | Treasury Bills [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	5,023	5,023
Unrealized Gains	161	101
Unrealized Losses	0	0
Estimated Fair Value	$ 5,184	$ 5,124

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