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LEASES - Narrative (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Additional amortization expense | $ 3,692,000 |  |
Restructuring | $ 3,510,000 | $ 979,000 |
Square feet under lease | ft² | 107,800 |  |
Rent expense |  | 11,900,000 | $ 5,900,000
Interest expense for finance leases |  | 52,000 | 14,000
Amortization expense for finance leases |  | 600,000 | $ 100,000
Facilities |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Restructuring | $ 900,000 |  |
2019 Restructuring Initiative |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Additional amortization expense | 3,700,000 |  |
Restructuring | 3,101,000 | 0 |
2019 Restructuring Initiative | Facilities |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Restructuring | $ 991,000 | $ 0 |

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- Definition Operating Lease, Area of Lease + References No definition available. + Details
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Namespace Prefix: | sons_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition The charge for the use of long-lived depreciable capital leased assets for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 840 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167768&loc=d3e56872-110439 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45031-112735 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The financing charge for leasing arrangements meeting the criteria for capitalization. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45031-112735 + Details
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Balance Type: | debit
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |