Revenue (Tables)

9 Months Ended

Sep. 30, 2020

Revenue From Contract With Customer [Abstract]

Schedule of Performance Obligation

Performance Obligation	When Performance Obligation is Typically Satisfied	When Payment is Typically Due	How Standalone Selling Price is Typically Estimated
Hardware products	When customer obtains control of the product (point-in-time)	Within 30-60 days of shipment	Observable in transactions without multiple performance obligations
Software licenses	When license is delivered to customer or made available for download, and the applicable license period has begun (point-in-time)	Within 30-60 days of the beginning of license period	Established pricing practices for software licenses bundled with software maintenance, which are separately observable in renewal transactions
Professional services	As services are performed and/or when the contract is fulfilled (point-in-time)	Within 30-60 days of delivery	Observable in transactions without multiple performance obligations
Software maintenance    and support services	Ratably over the course of the support contract (over time)	Within 30-60 days of the beginning of the contract period	Observable in renewal transactions
Extended hardware    warranties	Ratably over the course of the support contract (over time)	Within 30-60 days of the beginning of the contract period	Observable in renewal transactions

Total Net Revenue Based on Disaggregation Criteria

Total net revenue based on the disaggregation criteria described above is as follows (in thousands):

	Three Months Ended September 30,
	2020						2019
	Point-in- Time		Over Time		Total		Point-in- Time		Over Time		Total
Americas	$	14,217	$	833	$	15,050	$	16,471	$	1,354	$	17,825
Europe and the Middle East		1,995		87		2,082		2,344		92		2,436
Asia-Pacific		7,727		—		7,727		2,765		—		2,765
Total	$	23,939	$	920	$	24,859	$	21,580	$	1,446	$	23,026

	Nine Months Ended September 30,
	2020						2019
	Point-in- Time		Over Time		Total		Point-in- Time		Over Time		Total
Americas	$	39,587	$	3,001	$	42,588	$	44,755	$	3,740	$	48,495
Europe and the Middle East		7,033		279		7,312		8,541		249		8,790
Asia-Pacific		12,184		—		12,184		7,500		—		7,500
Total	$	58,804	$	3,280	$	62,084	$	60,796	$	3,989	$	64,785

Changes in Deferred Revenue

Changes in deferred revenue during the nine months ended September 30, 2020 and 2019 were as follows (in thousands):

	Nine Months Ended September 30,
	2020			2019
Deferred revenue, beginning of period	$	2,833		$	2,810
Fair value of deferred revenue acquired in acquisition, net of recognition		—			4
Deferral of revenue billed in current period, net of recognition		1,719			2,567
Recognition of revenue deferred in prior periods		(1,877	)		(1,816	)
Deferred revenue as, end of period	$	2,675		$	3,565