XML 36 R77.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

RESTRUCTURING AND FACILITIES CONSOLIDATION INTIATIVES - Restructuring Initiatives (Details) - USD ($) $ in Thousands | 1 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2016 | Jun. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at the beginning of the period |  |  | $ 979 |  |
Initiatives charged to expense |  |  | 16,399 | $ 17,015 | $ 9,436
Cash payments |  |  |  | (1,000) |
Balance at the end of the period |  |  | 3,510 | 979 |
2019 Restructuring Initiative |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at the beginning of the period |  |  | 0 |  |
Initiatives charged to expense |  |  | 7,475 |  |
Cash payments |  |  | (4,374) |  |
Balance at the end of the period |  |  | 3,101 | 0 |
Merger Restructuring |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at the beginning of the period |  |  | 2,681 | 7,595 |
Initiatives charged to expense |  |  | 5,232 | 16,134 |
Adjustments for changes in estimate |  |  |  | (5) |
Cash payments |  |  | (6,733) | (21,043) |
Balance at the end of the period |  |  | 409 | 2,681 | 7,595
GENBAND Restructuring |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at the beginning of the period |  |  | 117 | 2,121 |
Initiatives charged to expense |  |  | 600 |  |
Adjustments for changes in estimate |  |  |  | 886 |
Cash payments |  |  |  | (2,890) |
Balance at the end of the period |  |  |  | 117 | 2,121
2016 Restructuring |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Initiatives charged to expense | $ 2,000 |  |  |  | 500
Taqua Restructuring Initiative |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Initiatives charged to expense |  | $ 1,800 |  |  | 700
Severance | 2019 Restructuring Initiative |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at the beginning of the period |  |  | 0 |  |
Initiatives charged to expense |  |  | 6,103 |  |
Cash payments |  |  | (3,993) |  |
Balance at the end of the period |  |  | 2,110 | 0 |
Severance | Merger Restructuring |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at the beginning of the period |  |  | 1,910 | 7,595 |
Initiatives charged to expense |  |  | 5,076 | 14,735 | 8,500
Adjustments for changes in estimate |  |  |  | (5) |
Cash payments |  |  | (6,577) | (20,415) |
Balance at the end of the period |  |  | 409 | 1,910 | 7,595
Severance | GENBAND Restructuring |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at the beginning of the period |  |  | 0 | 1,916 |
Adjustments for changes in estimate |  |  |  | 487 |
Cash payments |  |  |  | (2,403) |
Balance at the end of the period |  |  |  | 0 | 1,916
Severance | 2016 Restructuring |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Initiatives charged to expense | 1,900 |  |  |  | 400
Severance | Taqua Restructuring Initiative |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Initiatives charged to expense |  | 1,200 |  |  | 200
Facilities |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at the end of the period |  |  | 900 |  |
Facilities | 2019 Restructuring Initiative |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at the beginning of the period |  |  | 0 |  |
Initiatives charged to expense |  |  | 1,372 |  |
Cash payments |  |  | (381) |  |
Balance at the end of the period |  |  | 991 | 0 |
Facilities | Merger Restructuring |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at the beginning of the period |  |  | 771 | 0 |
Initiatives charged to expense |  |  | 156 | 1,399 |
Adjustments for changes in estimate |  |  |  | 0 |
Cash payments |  |  | (156) | (628) |
Balance at the end of the period |  |  | 0 | 771 | 0
Facilities | GENBAND Restructuring |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at the beginning of the period |  |  | 117 | 205 |
Adjustments for changes in estimate |  |  |  | 399 |
Cash payments |  |  |  | (487) |
Balance at the end of the period |  |  | 0 | 117 | 205
Facilities | 2016 Restructuring |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at the beginning of the period |  |  | 58 | 95 |
Initiatives charged to expense | $ 100 |  |  |  | 100
Cash payments |  |  | (58) | (37) |
Balance at the end of the period |  |  | 0 | 58 | 95
Facilities | Taqua Restructuring Initiative |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at the beginning of the period |  |  | 33 | 365 |
Initiatives charged to expense |  | $ 600 |  |  | 500
Cash payments |  |  |  | (332) |
Balance at the end of the period |  |  | 0 | $ 33 | $ 365
Accounting Standards Update 2016-02 | Merger Restructuring |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Adjustment for the impact of ASC 842 adoption |  |  | (771) |  |
Accounting Standards Update 2016-02 | Severance | Merger Restructuring |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Adjustment for the impact of ASC 842 adoption |  |  | 0 |  |
Accounting Standards Update 2016-02 | Facilities | Merger Restructuring |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Adjustment for the impact of ASC 842 adoption |  |  | (771) |  |
Accounting Standards Update 2016-02 | Facilities | GENBAND Restructuring |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Adjustment for the impact of ASC 842 adoption |  |  | (117) |  |
Accounting Standards Update 2016-02 | Facilities | Taqua Restructuring Initiative |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Adjustment for the impact of ASC 842 adoption |  |  | $ (33) |  |

X
- Definition Restructuring Reserve, Adjustment for Adoption of New Accounting Pronouncement + References No definition available. + Details
Name: | sons_RestructuringReserveAdjustmentforAdoptionofNewAccountingPronouncement
Namespace Prefix: | sons_
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 -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585 + Details
Name: | us-gaap_PaymentsForRestructuring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + 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
- Details
Name: | us-gaap_RestructuringPlanAxis=sons_A2019RestructuringInitiativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=sons_MergerRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=sons_GENBANDRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=sons_A2016RestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=sons_TaquaRestructuringInitiativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_FacilityClosingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |