Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Summary of revenue

The following table presents a summary of revenue:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2020		2019		2020		2019
Subscription revenue	$	96,792	$	75,503	$	275,192	$	209,610
Perpetual license and maintenance revenue	12,448		13,797		38,046		40,877
Professional services and other revenue	3,042		2,552		8,901		7,050
Revenue	$	112,282	$	91,852	$	322,139	$	257,537

Activity of deferred contract costs

The following summarizes the activity of deferred incremental costs of obtaining a contract:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2020		2019		2020		2019
Beginning balance	$	71,768	$	61,866	$	72,265	$	59,434
Capitalization of contract acquisition costs	8,301		9,612		23,314		24,846
Amortization of deferred contract acquisition costs	(8,185)		(6,955)		(23,695)		(19,757)
Ending balance	$	71,884	$	64,523	$	71,884	$	64,523