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Investments - Summary of Debt Securities Available for Sale Maturity (Detail)
$ in Thousands
Sep. 30, 2021
USD ($)
Available For Sale Securities Debt Maturities [Abstract]  
Available-for-Sale, Amortized Cost, One year or less $ 2,450
Available-for-Sale, Amortized Cost, More than one year 492
Available-for-sale securities, Amortized Cost 2,942
Available-for-Sale, Estimated Fair Value, One year or less 2,451
Available-for-Sale, Estimated Fair Value, More than one year 492
Available-for-sale, Estimated Fair Value, Total investments $ 2,943