Description of the Business and Summary of Significant Accounting Policies - Deferred Commissions, Net (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Capitalized Contract Cost [Line Items]
Additional contract costs deferred	$ 11,200,000	$ 6,400,000	$ 19,000,000.0	$ 13,700,000
Deferred contract costs, amortization period	5 years		5 years
Amortization of deferred commissions	$ 5,700,000	4,200,000	$ 10,800,000	8,100,000
Impairment loss related to deferred costs	0	$ 0	0	$ 0
Deferred Commissions | Prepaid Expenses and Other Current Assets
Capitalized Contract Cost [Line Items]
Deferred contract costs	24,900,000		24,900,000		$ 19,900,000
Deferred Commissions | Other Assets
Capitalized Contract Cost [Line Items]
Deferred contract costs	$ 46,700,000		$ 46,700,000		$ 43,500,000