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Income Taxes - Valuation Allowance for Deferred Tax Assets (Detail) - Valuation Allowance of Deferred Tax Assets - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning Balance $ (12,892) $ (13,578) $ (13,257)
Charges To Costs and Expenses (326) 771 (414)
Charged To Other Accounts 0 (85) 93
Ending Balance $ (13,218) $ (12,892) $ (13,578)