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Revenues from Contracts with Customers - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]      
Deferred revenue $ 2.2   $ 2.9
Deferred revenue, revenue recognized $ 1.5 $ 1.9