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REVENUE RECOGNITION (Tables)

12 Months Ended

Dec. 31, 2022

Revenue from Contract with Customer [Abstract]

Schedule of timing of performance obligation

The Company's typical performance obligations include the following:

Performance Obligation

When Performance Obligation is Typically Satisfied

When Payment is Typically Due

Software and Product Revenue

Software licenses (perpetual or term)

Upon transfer of control; typically, when made available for download (point in time)

Generally, within 30 days of invoicing except for term licenses, which may be paid for over time

Software licenses (subscription)

Upon activation of hosted site (over time)

Generally, within 30 days of invoicing

Hardware

When control of the hardware passes to the customer; typically, upon delivery (point in time)

Generally, within 30 days of invoicing

Software upgrades

Upon transfer of control; typically, when made available for download (point in time)

Generally, within 30 days of invoicing

Customer Support Revenue

Customer support

Ratably over the course of the support contract (over time)

Generally, within 30 days of invoicing

Professional Services

Other professional services (excluding training services)

As work is performed (over time)

Generally, within 30 days of invoicing (upon completion of services)

Training

When the class is taught (point in time)

Generally, within 30 days of services being performed

Schedule of Disaggregation of revenue

The Company's total revenue for the years ended December 31, 2022, 2021 and 2020 was disaggregated geographically as follows:

Year ended December 31, 2022			Product revenue						Service revenue (maintenance)						Service revenue (professional services)						Total revenue
United States			$	175,189					$	132,655					$	44,819					$	352,663
Europe, Middle East and Africa			147,523						75,948						29,310						252,781
Asia Pacific			95,828						41,677						13,594						151,099
Other			24,140						31,815						7,262						63,217
			$	442,680					$	282,095					$	94,985					$	819,760

Year ended December 31, 2021			Product revenue						Service revenue (maintenance)						Service revenue (professional services)						Total revenue
United States			$	196,058					$	132,683					$	47,296					$	376,037
Europe, Middle East and Africa			138,203						79,475						30,349						248,027
Asia Pacific			92,803						41,945						18,183						152,931
Other			25,978						32,218						9,766						67,962
			$	453,042					$	286,321					$	105,594					$	844,957

Year ended December 31, 2020			Product revenue						Service revenue (maintenance)						Service revenue (professional services)						Total revenue
United States			$	201,347					$	132,661					$	48,611					$	382,619
Europe, Middle East and Africa			149,567						73,475						25,226						248,268
Asia Pacific			90,201						36,628						19,627						146,456
Other			26,797						32,052						7,603						66,452
			$	467,912					$	274,816					$	101,067					$	843,795

The Company's product revenue from its direct sales program and from indirect sales through its channel partner program for the years ended December 31, 2022, 2021 and 2020 was as follows (in thousands):

			Year ended December 31,
			2022						2021						2020
Indirect sales through channel program			$	131,998					$	117,065					$	134,876
Direct sales			310,682						335,977						333,036
			$	442,680					$	453,042					$	467,912

The Company's product revenue from sales to enterprise customers and from sales to service provider customers for the years ended December 31, 2022, 2021 and 2020 was as follows (in thousands):

			Year ended December 31,
			2022						2021						2020
Sales to enterprise customers			$	125,664					$	111,494					$	138,469
Sales to service provider customers			317,016						341,548						329,443
			$	442,680					$	453,042					$	467,912

The Company's product revenue and service revenue components by segment for the years ended December 31, 2022, 2021 and 2020 was as follows (in thousands):

			Year ended December 31,
			2022						2021						2020
Product revenue
Cloud and Edge			215,770						248,570						275,445
IP Optical Networks			226,910						204,472						192,467
Total product revenue			442,680						453,042						467,912
Service revenue
Maintenance
Cloud and Edge			222,238						228,321						229,035
IP Optical Networks			59,857						58,000						45,781
Total maintenance revenue			282,095						286,321						274,816
Professional services
Cloud and Edge			70,130						79,765						78,790
IP Optical Networks			24,855						25,829						22,277
Total professional services revenue			94,985						105,594						101,067
Total service revenue			377,080						391,915						375,883

Schedule of customer assets and liabilities

The changes in the Company's accounts receivable, unbilled receivables and deferred revenue balances for the years ended December 31, 2022 and 2021 were as follows (in thousands):

			Accounts receivable						Unbilled accounts receivable						Deferred revenue (current)						Deferred revenue (long-term)
Balance at January 1, 2022			$	208,972					$	73,945					$	109,119					$	20,619
Increase (decrease), net			(38,003)						22,330						4,820						(1,365)
Balance at December 31, 2022			$	170,969					$	96,275					$	113,939					$	19,254

			Accounts receivable						Unbilled accounts receivable						Deferred revenue (current)						Deferred revenue (long-term)
Balance at January 1, 2021			$	179,331					$	58,407					$	96,824					$	26,010
Increase (decrease), net			29,641						15,538						12,295						(5,391)
Balance at December 31, 2021			$	208,972					$	73,945					$	109,119					$	20,619

X

- Definition

Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045

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- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045

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- Definition

Tabular disclosure of expected timing for satisfying remaining performance obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130556-203045

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