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PROPERTY AND EQUIPMENT - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Abstract] |  |  |
Depreciation and amortization of property and equipment | $ 11,949 | $ 11,200 | $ 8,486

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets to periods that benefit from use of the assets. + References No definition available. + Details
Name: | sons_DepreciationAndAmortizationOfTangibleAssets
Namespace Prefix: | sons_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration