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Deferred Commissions (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Capitalized Contract Cost      
Deferred commissions $ 30,900,000   $ 29,800,000
Deferred commissions amortization 3,900,000 $ 3,800,000  
Deferred commissions impairment $ 0 $ 0  
Minimum      
Capitalized Contract Cost      
Sales commissions amortization period 3 years    
Maximum      
Capitalized Contract Cost      
Sales commissions amortization period 7 years