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Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Commitments And Contingencies Disclosure [Abstract]        
Accrued other long-term liabilities $ 7.7   $ 7.7  
Estimated sales and marketing expense (benefit) 0.6 $ 0.4 1.1 $ 1.1
Freezing amount in cash resulted from court pending legal action issued 0.5   0.5  
Accruals related court pending legal dispute $ 0.8   $ 0.8