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Marketable Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Marketable Securities [Abstract]          
Fair value of securities owned $ 300   $ 300   $ 400
Realized and unrealized net gains (loss) on marketable securities $ (100) $ 21 (100) $ 10  
Purchase of marketable securities     $ 0 $ 0