Revenue Recognition - Summary of Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenue	$ 271,141	$ 200,882	$ 147,094
Subscription Services
Disaggregation Of Revenue [Line Items]
Revenue	242,651	179,934	137,260
Professional Services
Disaggregation Of Revenue [Line Items]
Revenue	20,410	17,187	9,538
Software Licenses and Other
Disaggregation Of Revenue [Line Items]
Revenue	$ 8,080	$ 3,761	$ 296