Revenue

9 Months Ended

Sep. 30, 2019

Revenue From Contract With Customer [Abstract]

Revenue

6. Revenue

Disaggregation of Revenue

Revenue by geographic region, based on the physical location of the customer, is (in thousands):

	Three months ended September 30,						Nine months ended September 30,
	2019			2018			2019			2018
United States	$	55,245		$	44,790		$	151,346		$	124,586
Foreign		13,090			10,449			37,932			28,707
Total revenue	$	68,335		$	55,239		$	189,278		$	153,293
Percentage of revenue generated outside of the United   States		19	%		19	%		20	%		19	%

Deferred Revenue and Performance Obligations

During the three months ended September 30, 2019, 75% to 85% of revenue recognized was included in our deferred revenue balance at the beginning of the period. During the nine months ended September 30, 2019, 55% to 65% of revenue recognized was included in our deferred revenue balance at the beginning of the period.

Transaction Price Allocated to the Remaining Performance Obligations

As of September 30, 2019, approximately $519 million of revenue is expected to be recognized from remaining performance obligations. We expect to recognize revenue on approximately 73% of these remaining performance obligations over the next 24 months, with the balance recognized thereafter.