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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, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost $ 20,477 $ 26,842
Unrealized Gains 0 0
Unrealized Losses 0 0
Estimated Fair Value 20,477 26,842
Cash Equivalents [Member] | Money Market Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 20,477 26,842
Unrealized Gains 0 0
Unrealized Losses 0 0
Estimated Fair Value $ 20,477 $ 26,842