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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for Credit Losses [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 38 $ 38 $ 128
Charged to costs & expenses (38) 38
Deductions 128
Balance at end of period 38 38
Deferred Tax Asset Valuation Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 45,818 48,616 5,816
Charged to costs & expenses 6,347 5,120 43,560
Deductions 1,601 7,918 760
Balance at end of period $ 50,564 $ 45,818 $ 48,616