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Deferred Commissions (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Capitalized Contract Cost          
Deferred commissions $ 36,200,000   $ 36,200,000   $ 32,300,000
Deferred commissions amortization $ 3,500,000 $ 3,000,000 9,600,000 $ 8,900,000  
Deferred commissions impairment     $ 0 $ 0  
Minimum          
Capitalized Contract Cost          
Sales commissions amortization period (in years)     3 years    
Maximum          
Capitalized Contract Cost          
Sales commissions amortization period (in years)     7 years