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Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]          
Accrued other long-term liabilities $ 5.7   $ 5.7    
Estimated sales and marketing expense 0.4 $ 0.3 0.7 $ 0.7  
Freezing amount in cash resulted from court pending legal action issued         $ 0.5
Accruals related court pending legal dispute $ 1.3   $ 1.3