Revenue Recognition - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Deferred sales commissions current	$ 11,400,000		$ 9,900,000
Deferred sales commissions noncurrent	14,500,000		14,200,000
Amortization expense for the deferred costs	2,900,000	$ 1,600,000
Impairment loss related to costs capitalized	0		$ 0
Subscription Services
Disaggregation Of Revenue [Line Items]
Revenue recognized	46,400,000	$ 31,700,000
Professional Services
Disaggregation Of Revenue [Line Items]
Revenue recognized	3,500,000
Revenue remaining performance obligation	5,700,000
Subscription and Other Contracts
Disaggregation Of Revenue [Line Items]
Revenue remaining performance obligation	$ 298,100,000