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Summary of the Changes in Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Receivables [Abstract]      
Balance at beginning of year $ 1 $ 2 $ 1
Additions: Bad debt expense 7 2 7
Less: Write-off (6) (3) (6)
Balance at end of year $ 2 $ 1 $ 2