Revenue and Deferred Revenue - Summary of Disaggregated Revenue by Sales Channel (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenue	$ 375,610	$ 307,421	$ 254,324
Self-serve Revenue
Disaggregation Of Revenue [Line Items]
Revenue	267,703	241,986	220,822
Enterprise Revenue
Disaggregation Of Revenue [Line Items]
Revenue	$ 107,907	$ 65,435	$ 33,502