<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.20.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>243</ContextCount>
  <ElementCount>462</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>76</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>10</UnitCount>
  <MyReports>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001000 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/CondensedConsolidatedBalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1001501 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/CondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1002000 - Statement - Condensed Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/CondensedConsolidatedStatementsOfOperations</Role>
      <ShortName>Condensed Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1003000 - Statement - Condensed Consolidated Statements of Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/CondensedConsolidatedStatementsOfComprehensiveLoss</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Loss</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1004000 - Statement - Condensed Consolidated Statements of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/CondensedConsolidatedStatementsOfStockholdersEquity</Role>
      <ShortName>Condensed Consolidated Statements of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1006000 - Statement - Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/CondensedConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2101100 - Disclosure - BASIS OF PRESENTATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/BasisOfPresentation</Role>
      <ShortName>BASIS OF PRESENTATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2102100 - Disclosure - BUSINESS ACQUISITIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/BusinessAcquisitions</Role>
      <ShortName>BUSINESS ACQUISITIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2103100 - Disclosure - EARNINGS (LOSS) PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/EarningsLossPerShare</Role>
      <ShortName>EARNINGS (LOSS) PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2104100 - Disclosure - INVENTORY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/Inventory</Role>
      <ShortName>INVENTORY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2105100 - Disclosure - INTANGIBLE ASSETS AND GOODWILL</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/IntangibleAssetsAndGoodwill</Role>
      <ShortName>INTANGIBLE ASSETS AND GOODWILL</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2106100 - Disclosure - ACCRUED EXPENSES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/AccruedExpenses</Role>
      <ShortName>ACCRUED EXPENSES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2107100 - Disclosure - RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/RestructuringAndFacilitiesConsolidationInitiatives</Role>
      <ShortName>RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2108100 - Disclosure - WARRANTY ACCRUALS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/WarrantyAccruals</Role>
      <ShortName>WARRANTY ACCRUALS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2109100 - Disclosure - DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/Debt</Role>
      <ShortName>DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2110100 - Disclosure - DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/DerivativeInstrumentsAndHedgingActivities</Role>
      <ShortName>DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2112100 - Disclosure - REVENUE RECOGNITION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/RevenueRecognition</Role>
      <ShortName>REVENUE RECOGNITION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2114100 - Disclosure - COMMON STOCK REPURCHASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/CommonStockRepurchases</Role>
      <ShortName>COMMON STOCK REPURCHASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2115100 - Disclosure - STOCK-BASED COMPENSATION PLANS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/StockBasedCompensationPlans</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2117100 - Disclosure - MAJOR CUSTOMERS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/MajorCustomers</Role>
      <ShortName>MAJOR CUSTOMERS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2120100 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/RelatedPartyTransactions</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2121100 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/IncomeTaxes</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2122100 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/Leases</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2124100 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/CommitmentsAndContingencies</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2201201 - Disclosure - BASIS OF PRESENTATION (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/BasisOfPresentationPolicies</Role>
      <ShortName>BASIS OF PRESENTATION (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2302301 - Disclosure - BUSINESS ACQUISITIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/BusinessAcquisitionsTables</Role>
      <ShortName>BUSINESS ACQUISITIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sonus.net/role/BusinessAcquisitions</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2303301 - Disclosure - EARNINGS (LOSS) PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/EarningsLossPerShareTables</Role>
      <ShortName>EARNINGS (LOSS) PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sonus.net/role/EarningsLossPerShare</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2304301 - Disclosure - INVENTORY (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/InventoryTables</Role>
      <ShortName>INVENTORY (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sonus.net/role/Inventory</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2305301 - Disclosure - INTANGIBLE ASSETS AND GOODWILL (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/IntangibleAssetsAndGoodwillTables</Role>
      <ShortName>INTANGIBLE ASSETS AND GOODWILL (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sonus.net/role/IntangibleAssetsAndGoodwill</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2306301 - Disclosure - ACCRUED EXPENSES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/AccruedExpensesTables</Role>
      <ShortName>ACCRUED EXPENSES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sonus.net/role/AccruedExpenses</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2307301 - Disclosure - RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/RestructuringAndFacilitiesConsolidationInitiativesTables</Role>
      <ShortName>RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sonus.net/role/RestructuringAndFacilitiesConsolidationInitiatives</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2308301 - Disclosure - WARRANTY ACCRUALS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/WarrantyAccrualsTables</Role>
      <ShortName>WARRANTY ACCRUALS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sonus.net/role/WarrantyAccruals</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2310301 - Disclosure - DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/DerivativeInstrumentsAndHedgingActivitiesTables</Role>
      <ShortName>DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sonus.net/role/DerivativeInstrumentsAndHedgingActivities</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2312301 - Disclosure - REVENUE RECOGNITION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/RevenueRecognitionTables</Role>
      <ShortName>REVENUE RECOGNITION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sonus.net/role/RevenueRecognition</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2315301 - Disclosure - STOCK-BASED COMPENSATION PLANS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/StockBasedCompensationPlansTables</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sonus.net/role/StockBasedCompensationPlans</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2317301 - Disclosure - MAJOR CUSTOMERS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/MajorCustomersTables</Role>
      <ShortName>MAJOR CUSTOMERS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sonus.net/role/MajorCustomers</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2322301 - Disclosure - LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/LeasesTables</Role>
      <ShortName>LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sonus.net/role/Leases</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2401402 - Disclosure - BASIS OF PRESENTATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/BasisOfPresentationDetails</Role>
      <ShortName>BASIS OF PRESENTATION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sonus.net/role/BasisOfPresentationPolicies</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2402402 - Disclosure - BUSINESS ACQUISITIONS - ECI Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/BusinessAcquisitionsEciNarrativeDetails</Role>
      <ShortName>BUSINESS ACQUISITIONS - ECI Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2402403 - Disclosure - BUSINESS ACQUISITIONS - Summary of Preliminary Allocation of Purchase Consideration (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/BusinessAcquisitionsSummaryOfPreliminaryAllocationOfPurchaseConsiderationDetails</Role>
      <ShortName>BUSINESS ACQUISITIONS - Summary of Preliminary Allocation of Purchase Consideration (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2402404 - Disclosure - BUSINESS ACQUISITIONS - Unaudited Pro Forma Results (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/BusinessAcquisitionsUnauditedProFormaResultsDetails</Role>
      <ShortName>BUSINESS ACQUISITIONS - Unaudited Pro Forma Results (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2402405 - Disclosure - BUSINESS ACQUISITIONS - Anova Data Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/BusinessAcquisitionsAnovaDataNarrativeDetails</Role>
      <ShortName>BUSINESS ACQUISITIONS - Anova Data Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2402406 - Disclosure - BUSINESS ACQUISITIONS - Summary of Acquisition Related Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/BusinessAcquisitionsSummaryOfAcquisitionRelatedCostsDetails</Role>
      <ShortName>BUSINESS ACQUISITIONS - Summary of Acquisition Related Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2403402 - Disclosure - EARNINGS (LOSS) PER SHARE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/EarningsLossPerShareDetails</Role>
      <ShortName>EARNINGS (LOSS) PER SHARE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sonus.net/role/EarningsLossPerShareTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2404402 - Disclosure - INVENTORY (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/InventoryDetails</Role>
      <ShortName>INVENTORY (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sonus.net/role/InventoryTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2405402 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Schedule of Intangible Assets and Amortization (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/IntangibleAssetsAndGoodwillScheduleOfIntangibleAssetsAndAmortizationDetails</Role>
      <ShortName>INTANGIBLE ASSETS AND GOODWILL - Schedule of Intangible Assets and Amortization (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2405403 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Schedule of Changes in Carrying Value of Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/IntangibleAssetsAndGoodwillScheduleOfChangesInCarryingValueOfGoodwillDetails</Role>
      <ShortName>INTANGIBLE ASSETS AND GOODWILL - Schedule of Changes in Carrying Value of Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2406402 - Disclosure - ACCRUED EXPENSES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/AccruedExpensesDetails</Role>
      <ShortName>ACCRUED EXPENSES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sonus.net/role/AccruedExpensesTables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2407402 - Disclosure - RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/RestructuringAndFacilitiesConsolidationInitiativesNarrativeDetails</Role>
      <ShortName>RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sonus.net/role/RestructuringAndFacilitiesConsolidationInitiativesTables</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2407403 - Disclosure - RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Components of Restructuring Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/RestructuringAndFacilitiesConsolidationInitiativesComponentsOfRestructuringExpenseDetails</Role>
      <ShortName>RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Components of Restructuring Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2407404 - Disclosure - RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Accrual Activity for Severance and Related Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/RestructuringAndFacilitiesConsolidationInitiativesAccrualActivityForSeveranceAndRelatedCostsDetails</Role>
      <ShortName>RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Accrual Activity for Severance and Related Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2407405 - Disclosure - RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Assumed Restructuring Initiative Rollforward (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/RestructuringAndFacilitiesConsolidationInitiativesAssumedRestructuringInitiativeRollforwardDetails</Role>
      <ShortName>RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Assumed Restructuring Initiative Rollforward (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2408402 - Disclosure - WARRANTY ACCRUALS - Changes in Accrual Balance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/WarrantyAccrualsChangesInAccrualBalanceDetails</Role>
      <ShortName>WARRANTY ACCRUALS - Changes in Accrual Balance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2408403 - Disclosure - WARRANTY ACCRUALS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/WarrantyAccrualsNarrativeDetails</Role>
      <ShortName>WARRANTY ACCRUALS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2409401 - Disclosure - DEBT - Credit Facilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/DebtCreditFacilitiesDetails</Role>
      <ShortName>DEBT - Credit Facilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2409402 - Disclosure - DEBT - Short-Term Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/DebtShortTermLoansDetails</Role>
      <ShortName>DEBT - Short-Term Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2409403 - Disclosure - DEBT - Letters of Credit and Performance and Bid Bonds (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/DebtLettersOfCreditAndPerformanceAndBidBondsDetails</Role>
      <ShortName>DEBT - Letters of Credit and Performance and Bid Bonds (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>2410402 - Disclosure - DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/DerivativeInstrumentsAndHedgingActivitiesNarrativeDetails</Role>
      <ShortName>DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>2410403 - Disclosure - DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Impact of Derivative Financial Instrument on Condensed Consolidated Statement of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/DerivativeInstrumentsAndHedgingActivitiesImpactOfDerivativeFinancialInstrumentOnCondensedConsolidatedStatementOfOperationsDetails</Role>
      <ShortName>DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Impact of Derivative Financial Instrument on Condensed Consolidated Statement of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>2410404 - Disclosure - DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Fair Values and Locations in the Condensed Consolidated Balance Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/DerivativeInstrumentsAndHedgingActivitiesFairValuesAndLocationsInCondensedConsolidatedBalanceSheetDetails</Role>
      <ShortName>DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Fair Values and Locations in the Condensed Consolidated Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>2412402 - Disclosure - REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/RevenueRecognitionScheduleOfDisaggregationOfRevenueDetails</Role>
      <ShortName>REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>2412403 - Disclosure - REVENUE RECOGNITION - Schedule of Customer Assets &amp; Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/RevenueRecognitionScheduleOfCustomerAssetsLiabilitiesDetails</Role>
      <ShortName>REVENUE RECOGNITION - Schedule of Customer Assets &amp; Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>2412404 - Disclosure - REVENUE RECOGNITION - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/RevenueRecognitionNarrativeDetails</Role>
      <ShortName>REVENUE RECOGNITION - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>2414401 - Disclosure - COMMON STOCK REPURCHASES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/CommonStockRepurchasesDetails</Role>
      <ShortName>COMMON STOCK REPURCHASES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sonus.net/role/CommonStockRepurchases</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>2415402 - Disclosure - STOCK-BASED COMPENSATION PLANS - Executive Equity Arrangements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/StockBasedCompensationPlansExecutiveEquityArrangementsDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Executive Equity Arrangements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>2415403 - Disclosure - STOCK-BASED COMPENSATION PLANS - Stock Options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/StockBasedCompensationPlansStockOptionsDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Stock Options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>2415404 - Disclosure - STOCK-BASED COMPENSATION PLANS - Restricted Stock Awards and Units and Performance-Based Stock Units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/StockBasedCompensationPlansRestrictedStockAwardsAndUnitsAndPerformanceBasedStockUnitsDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Restricted Stock Awards and Units and Performance-Based Stock Units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>2415405 - Disclosure - STOCK-BASED COMPENSATION PLANS - Employee Stock Purchase Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/StockBasedCompensationPlansEmployeeStockPurchasePlanDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Employee Stock Purchase Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>2415406 - Disclosure - STOCK-BASED COMPENSATION PLANS - Stock-Based Compensation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/StockBasedCompensationPlansStockBasedCompensationDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Stock-Based Compensation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>2417402 - Disclosure - MAJOR CUSTOMERS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/MajorCustomersDetails</Role>
      <ShortName>MAJOR CUSTOMERS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sonus.net/role/MajorCustomersTables</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>2420401 - Disclosure - RELATED PARTY TRANSACTIONS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/RelatedPartyTransactionsDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sonus.net/role/RelatedPartyTransactions</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>2422402 - Disclosure - LEASES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/LeasesNarrativeDetails</Role>
      <ShortName>LEASES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>2422403 - Disclosure - LEASES - Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/LeasesAssetsAndLiabilitiesDetails</Role>
      <ShortName>LEASES - Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>2422404 - Disclosure - LEASES - Components of Lease Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/LeasesComponentsOfLeaseExpenseDetails</Role>
      <ShortName>LEASES - Components of Lease Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>2422405 - Disclosure - LEASES - Other Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/LeasesOtherInformationDetails</Role>
      <ShortName>LEASES - Other Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>2422406 - Disclosure - LEASES - Future Minimum Lease Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/LeasesFutureMinimumLeasePaymentsDetails</Role>
      <ShortName>LEASES - Future Minimum Lease Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="sons-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>2424401 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sonus.net/role/CommitmentsAndContingenciesDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sonus.net/role/CommitmentsAndContingencies</ParentRole>
      <Position>78</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>sons-20200331.xml</File>
    <File>sons-20200331.xsd</File>
    <File>sons-20200331_cal.xml</File>
    <File>sons-20200331_def.xml</File>
    <File>sons-20200331_lab.xml</File>
    <File>sons-20200331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/us-gaap/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/country/2017-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/srt/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2018-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
