Revenue Recognition - Summary of Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Revenue	$ 71,256	$ 52,547	$ 195,533	$ 143,771
Subscription Services
Disaggregation Of Revenue [Line Items]
Revenue	63,627	45,616	176,944	128,422
Professional Services
Disaggregation Of Revenue [Line Items]
Revenue	4,543	6,162	13,677	11,728
Software Licenses and Other
Disaggregation Of Revenue [Line Items]
Revenue	$ 3,086	$ 769	$ 4,912	$ 3,621