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Deferred Commissions (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Capitalized Contract Cost          
Deferred commissions $ 33,600,000   $ 33,600,000   $ 32,300,000
Deferred commissions amortization $ 3,100,000 $ 2,900,000 6,100,000 $ 5,900,000  
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