Annual report pursuant to Section 13 and 15(d)

Investments in Marketable Debt Securities, Available-for-Sale - Gross Realized Gains and Losses from Sale of Available for Sale Securities (Detail)

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Investments in Marketable Debt Securities, Available-for-Sale - Gross Realized Gains and Losses from Sale of Available for Sale Securities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]      
Gross realized gains $ 221 $ 241 $ 134
Gross realized losses $ (2) $ (49) $ (47)