Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

The following table summarizes revenue from contracts with customers for the three and six months ended June 30, 2019 and 2018:



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(in thousands)
Subscription revenue	$	52,309	$	31,361	$	99,278	$	60,130
Term and perpetual software licenses	10,315		6,697		18,991		12,257
Maintenance and support	9,372		10,610		18,929		21,363
Professional services	6,380		8,788		13,720		17,271
Other	583		985		1,226		1,935
Total revenue	$	78,959	$	58,441	$	152,144	$	112,956

The following table summarizes the revenue by region based on the shipping address of customers who have contracted to use our products or services for the three and six months ended June 30, 2019 and 2018:



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(in thousands)
United States	$	64,106	$	47,773	$	124,046	$	91,983
All other	14,853		10,668		28,098		20,973
Total revenue	$	78,959	$	58,441	$	152,144	$	112,956

Capitalized Contract Cost

The following table summarizes the activity of the deferred contract acquisition and fulfillment costs for the six months ended June 30, 2019 and 2018:



	Six Months Ended June 30,
	2019			2018
	(in thousands)
Beginning balance	$	39,955		$	27,165
Capitalization of contract acquisition and fulfillment costs	10,067			8,921
Amortization of deferred contract acquisition and fulfillment costs	(6,896		)	(4,391		)
Ending balance	$	43,126		$	31,695

Remaining Performance Obligation

The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied or partially unsatisfied as of June 30, 2019. The estimated revenues do not include unexercised contract renewals.



	Remainder of 2019		2020		2021 and thereafter
	(in thousands)
Subscription revenue	$	96,471	$	64,955	$	14,811
Term and perpetual software licenses	14,819		16,352		13,222
Maintenance and support	15,908		11,237		2,327