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Related Parties (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Related Party Transactions [Abstract]        
Revenue from related parties $ 0.3 $ 0.2 $ 0.9 $ 0.7