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DEBT - New Senior Secured Credit Facility (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Apr. 29, 2019	Dec. 31, 2018	Dec. 21, 2017
Debt Instrument [Line Items]
Outstanding debt			$ 55,000,000
Debt interest rate			5.96%
Line of Credit
Debt Instrument [Line Items]
Commitment potential aggregate increase amount				$ 50,000,000
Letter of Credit | Line of Credit
Debt Instrument [Line Items]
Commitments from lender				15,000,000
Outstanding debt			$ 2,700,000
Debt interest rate	1.50%		1.75%
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Commitments from lender		$ 100,000,000		$ 100,000,000
Debt interest rate	3.30%
Default rate percentage	2.00%
Revolving Credit Facility | Line of Credit | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Revolving Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Revolving Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
Revolving Credit Facility | Line of Credit | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Revolving Credit Facility | Line of Credit | Prime Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
New Credit Facility
Debt Instrument [Line Items]
Outstanding debt	$ 48,800,000
New Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate principal amount		50,000,000
New Credit Facility | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Outstanding debt	8,000,000
2019 Credit Facility
Debt Instrument [Line Items]
Commitment potential aggregate increase amount		$ 75,000,000
2019 Credit Facility | Letter of Credit | Line of Credit
Debt Instrument [Line Items]
Outstanding debt	$ 5,400,000
2019 Credit Facility | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Default rate percentage	2.00%
2019 Credit Facility | Revolving Credit Facility | Line of Credit | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
2019 Credit Facility | Revolving Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
2019 Credit Facility | Revolving Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
2019 Credit Facility | Revolving Credit Facility | Line of Credit | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
2019 Credit Facility | Revolving Credit Facility | Line of Credit | Prime Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%

X

- Definition

Line Of Credit Facility, Potential Aggregate Increase Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	sons_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Line of Credit Facility, Default Rate, Percentage

+ References

No definition available.

+ Details

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X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

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-Section 55
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-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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X

- 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.

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X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

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-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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