XML 100 R78.htm IDEA: XBRL DOCUMENT v3.25.4

RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Accrued restructuring liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Restructuring plan accrual activity
Balance at the beginning of the period	$ 2,199	$ 2,191	$ 3,358
Charged to expense	19,989	10,216	16,209
Transfer to operating lease assets			(1,008)
Reversals/adjustments	(331)	(56)
Payments	(11,968)	(10,152)	(16,368)
Balance at the end of the period	9,889	2,199	2,191
2022 and Prior Restructuring Plans
Restructuring plan accrual activity
Balance at the beginning of the period	1,115	1,520	3,358
Charged to expense	5,992	6,123	6,334
Transfer to operating lease assets			(1,008)
Reversals/adjustments		(56)
Payments	(6,301)	(6,472)	(7,164)
Balance at the end of the period	806	1,115	1,520
2023 Restructuring Plan
Restructuring plan accrual activity
Balance at the beginning of the period	85	671
Charged to expense	70	2,003	9,875
Reversals/adjustments	90
Payments	(245)	(2,589)	(9,204)
Balance at the end of the period		85	$ 671
2024 Restructuring Plan
Restructuring plan accrual activity
Balance at the beginning of the period	999
Charged to expense	99	2,090
Reversals/adjustments	(319)
Payments	(779)	(1,091)
Balance at the end of the period		$ 999
2025 Restructuring Plan
Restructuring plan accrual activity
Charged to expense	5,188
Reversals/adjustments	(102)
Payments	(4,464)
Balance at the end of the period	622
2026 Restructuring Plan
Restructuring plan accrual activity
Charged to expense	8,640
Payments	(179)
Balance at the end of the period	$ 8,461

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan, before adjustment. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

No definition available.

+ Details

Name:	rbbn_RestructuringChargesBeforeAdjustment
Namespace Prefix:	rbbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-17

+ Details

Name:	us-gaap_PaymentsForRestructuring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

+ Details

Name:	us-gaap_RestructuringReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

+ Details

Name:	us-gaap_RestructuringReserveAccrualAdjustment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringReserveRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of decrease in the reserve for full or partial settlement through consideration other than cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

+ Details

Name:	us-gaap_RestructuringReserveSettledWithoutCash2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_RestructuringPlanAxis=rbbn_A2022RestructuringInitiativeAndPriorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestructuringPlanAxis=rbbn_A2023RestructuringInitiativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestructuringPlanAxis=rbbn_WorkforceReductions2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestructuringPlanAxis=rbbn_A2025RestructuringInitiativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestructuringPlanAxis=rbbn_RestructuringPlan2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: