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Leases - Components of Lease Expense (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease Expense [Line Items]    
Interest on lease liabilities [1] $ 0.4 $ 0.0
Maximum [Member]    
Lease Expense [Line Items]    
Interest on lease liabilities   $ 0.1
[1] Interest on lease liabilities was less than $0.1 million for the year ended December 31, 2019.