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Investments and Fair Value Instruments - Summary of Amortized Cost and Fair Value of Investment Securities Portfolio (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 19,283	$ 26,842
Estimated Fair Value	19,283	26,842
Cash Equivalents [Member] | Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	19,283	26,842
Estimated Fair Value	$ 19,283	$ 26,842

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