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Revenue - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]        
Revenue recognized from deferred revenue $ 1.3 $ 1.3 $ 4.2 $ 1.5
Contractual obligation recognized in remainder of 2021 2.4   2.4  
Contractual obligation recognized in 2022 3.8   3.8  
Contractual obligation recognized in 2023 1.7   1.7  
Contractual obligation recognized thereafter $ 0.8   $ 0.8