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REVENUE RECOGNITION (Tables)

3 Months Ended

Mar. 31, 2023

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 revenue for the three months ended March 31, 2023 and 2022 was disaggregated as follows:

Three months ended March 31, 2023			Product revenue						Service revenue (maintenance)						Service revenue (professional services)						Total revenue
United States			$	38,067					$	33,073					$	10,853					$	81,993
Europe, Middle East and Africa			27,435						20,127						6,575						54,137
Asia Pacific			25,615						9,372						3,144						38,131
Other			2,201						8,016						1,681						11,898
			$	93,318					$	70,588					$	22,253					$	186,159

Three months ended March 31, 2022			Product revenue						Service revenue (maintenance)						Service revenue (professional services)						Total revenue
United States			$	31,940					$	33,064					$	10,645					$	75,649
Europe, Middle East and Africa			24,410						17,742						6,811						48,963
Asia Pacific			22,390						10,425						3,447						36,262
Other			3,250						7,374						1,700						12,324
			$	81,990					$	68,605					$	22,603					$	173,198

The Company's product revenue from indirect sales through its channel partner program and from its direct sales program for the three months ended March 31, 2023 and 2022 was as follows (in thousands):

			Three months ended
			March 31, 2023						March 31, 2022
Indirect sales through channel partner program			$	35,914					$	23,500
Direct sales			57,404						58,490
			$	93,318					$	81,990

The Company's product revenue from sales to enterprise customers and from sales to service provider customers for the three months ended March 31, 2023 and 2022 was as follows (in thousands):

			Three months ended
			March 31, 2023						March 31, 2022
Sales to enterprise customers			$	27,412					$	22,083
Sales to service provider customers			65,906						59,907
			$	93,318					$	81,990

The Company's product revenue and service revenue components by segment for the three months ended March 31, 2023 and 2022 were as follows (in thousands):

			Three months ended
			March 31, 2023						March 31, 2022
Product revenue:
Cloud and Edge			$	42,839					$	37,635
IP Optical Networks			50,479						44,355
Total product revenue			$	93,318					$	81,990
Service revenue:
Maintenance:
Cloud and Edge			$	54,810					$	55,030
IP Optical Networks			15,778						13,575
Total maintenance revenue			70,588						68,605
Professional services:
Cloud and Edge			16,831						17,141
IP Optical Networks			5,422						5,462
Total professional services revenue			22,253						22,603
Total service revenue			$	92,841					$	91,208

Schedule of Customer Assets and Liabilities

The changes in the Company's accounts receivable, unbilled receivables and deferred revenue balances for the three months ended March 31, 2023 were as follows (in thousands):

			Accounts receivable						Unbilled accounts receivable						Deferred revenue (current)						Deferred revenue (long-term)
Balance at January 1, 2023			$	170,969					$	96,275					$	113,939					$	19,254
Increase (decrease), net			(4,228)						(7,870)						7,822						(898)
Balance at March 31, 2023			$	166,741					$	88,405					$	121,761					$	18,356

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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