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REVENUE RECOGNITION (Tables)

3 Months Ended

Mar. 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

Disaggregation of Revenue

The Company's revenue for the three months ended March 31, 2022 and 2021 was disaggregated as follows:

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

Three months ended March 31, 2021			Product revenue						Service revenue (maintenance)						Service revenue (professional services)						Total revenue
United States			$	36,812					$	31,606					$	11,162					$	79,580
Europe, Middle East and Africa			28,208						19,655						6,910						54,773
Asia Pacific			25,582						9,748						5,803						41,133
Other			7,287						7,696						2,303						17,286
			$	97,889					$	68,705					$	26,178					$	192,772

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, 2022 and 2021 was as follows (in thousands):

									Three months ended
															March 31, 2022						March 31, 2021
Indirect sales through channel partner program															$	23,500					$	20,163
Direct sales															58,490						77,726
															$	81,990					$	97,889

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

									Three months ended
															March 31, 2022						March 31, 2021
Sales to enterprise customers															$	22,083					$	22,668
Sales to service provider customers															59,907						75,221
															$	81,990					$	97,889

The Company's product revenue and service revenue components by segment for the three months ended March 31, 2022 and 2021 were as follows (in thousands):

									Three months ended
															March 31, 2022						March 31, 2021
Product revenue:
Cloud and Edge															$	37,635					$	50,152
IP Optical Networks															44,355						47,737
Total product revenue															$	81,990					$	97,889
Service revenue:
Maintenance:
Cloud and Edge															$	55,030					$	54,673
IP Optical Networks															13,575						14,032
Total maintenance revenue															68,605						68,705
Professional services:
Cloud and Edge															17,141						20,597
IP Optical Networks															5,462						5,581
Total professional services revenue															22,603						26,178
Total service revenue															$	91,208					$	94,883

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, 2022 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			(67,879)						5,926						(35)						(1,307)
Balance at March 31, 2022			$	141,093					$	79,871					$	109,084					$	19,312

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 http://asc.fasb.org/extlink&oid=123351226&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 http://asc.fasb.org/extlink&oid=123351226&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 http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045

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