Revenue (Tables)

3 Months Ended

Mar. 31, 2021

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
Subscriptions	Ratably over the course of the subscription term (over time)	In advance of subscription term	Contractually stated or list price
Professional services	As services are performed and/or when 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 March 31,
	2021						2020
	Point-in- Time		Over Time		Total		Point-in- Time		Over Time		Total
Americas	$	14,396	$	752	$	15,148	$	12,705	$	1,163	$	13,868
Europe and the Middle East		2,364		96		2,460		2,504		97		2,601
Asia-Pacific		4,554		—		4,554		1,651		—		1,651
Total	$	21,314	$	848	$	22,162	$	16,860	$	1,260	$	18,120

Changes in Deferred Revenue

Changes in deferred revenue during the three months ended March 31, 2021 and March 2020 were as follows (in thousands):

	Three Months Ended March 31,
	2021			2020
Deferred revenue, beginning of period	$	2,366		$	2,833
Deferral of revenue billed in current period, net of recognition		392			384
Recognition of revenue deferred in prior periods		(793	)		(931	)
Deferred revenue as, end of period	$	1,965		$	2,286