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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Revenue From Contracts With Customers [Line Items]          
Percentage of net revenues through indirect channels     10.00% 10.00%  
Deferred revenue, revenue recognized     $ 60.3    
Contracted revenue not yet recognized $ 128.5 $ 117.9 $ 128.5 $ 117.9  
Contracted revenue recognize percentage 84.00% 84.00% 84.00% 84.00%  
Sales and Marketing Expense [Member]          
Revenue From Contracts With Customers [Line Items]          
Sales commissions $ 1.9 $ 1.0 $ 3.5 $ 1.6  
Prepaid and Other Current Assets [Member]          
Revenue From Contracts With Customers [Line Items]          
Capitalized contract cost net, current 4.7   4.7   $ 3.7
Contract assets 2.8   2.8   1.4
Other Long-Term Assets [Member]          
Revenue From Contracts With Customers [Line Items]          
Capitalized contract cost net, noncurrent 0.5   0.5   0.6
Contract assets         1.3
Accounts Receivable [Member]          
Revenue From Contracts With Customers [Line Items]          
Contract assets $ 6.0   $ 6.0   $ 6.7