Deferred Commissions (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Capitalized Contract Cost
Deferred commissions	$ 31,300,000		$ 31,300,000		$ 29,800,000
Deferred commissions amortization	4,200,000	$ 4,400,000	11,700,000	$ 12,300,000
Deferred commissions impairment	$ 0	$ 0	$ 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