Revenue Recognition - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Deferred sales commissions current	$ 11,200,000		$ 11,200,000		$ 9,900,000
Deferred sales commissions noncurrent	14,100,000		14,100,000		14,200,000
Amortization expense for the deferred costs	2,800,000	$ 2,000,000.0	5,700,000	$ 3,600,000
Impairment loss related to costs capitalized			0		$ 0
Subscription Services
Disaggregation Of Revenue [Line Items]
Revenue recognized	51,200,000	$ 35,000,000.0	83,000,000.0	$ 62,900,000
Professional Services
Disaggregation Of Revenue [Line Items]
Revenue recognized	3,900,000		5,400,000
Revenue remaining performance obligation	7,600,000		7,600,000
Subscription and Other Contracts
Disaggregation Of Revenue [Line Items]
Revenue remaining performance obligation	$ 311,100,000		$ 311,100,000