| IRS990/AccountantCompileOrReviewInd | 0 | false |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 8766096 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 7398288 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 5908155 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 7309621 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | THE EDX MISSION IS TO EXPAND ACCESS TO EDUCATION AND BECOME A LEADING RESOURCE FOR LEARNERS AND LEARNING WORLDWIDE BY PROVIDING AND ENHANCING TEACHING AND LEARNING ON CAMPUS AND ONLINE THROUGH ADVANCED TECHNOLOGIES AND RESEARCH. |
| IRS990/AllOtherContributionsAmt | 0 | 2321126 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 0 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 0 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 0 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 0 |
| IRS990/AmendedReturnInd | 0 | X |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | true |
| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
| IRS990/BenefitsToMembersGrp/ProgramServicesAmt | 0 | 0 |
| IRS990/BenefitsToMembersGrp/TotalAmt | 0 | 0 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | Peter Brau |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 4157301709 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 141 Portland Street 9th Floor |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | Cambridge |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02139 |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 25613650 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 22292565 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 6 |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 803183 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 3465242 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 4268425 |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | true |
| IRS990/ConferencesMeetingsGrp/ManagementAndGeneralAmt | 0 | 27864 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 120214 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 148078 |
| IRS990/ConflictOfInterestPolicyInd | 0 | true |
| IRS990/ConservationEasementsInd | 0 | false |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 1577045 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 1 | 278510 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 2 | 234455 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 3 | 233400 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 4 | 203856 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 2035 Central Circle 201 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | 66 Tanner Street |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 2 | 200 E Randoph Drive |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 3 | 56 N Haddon Avenue 1st Floor |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 4 | 611 N Brand Boulevard 10th Floor |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | McKinney |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | Haddonfield |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 2 | Chicago |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 3 | Haddonfield |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 4 | Glendale |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | TX |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 1 | NJ |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 2 | IL |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 3 | NJ |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 4 | CA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 75069 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 08033 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 2 | 60601 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 3 | 08033 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 4 | 91203 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | Arbisoft LLC |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 1 | True Capital Partners True Search |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 2 | Edelman |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 3 | True Synthesis LLC |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 4 | PSI Services LLC |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | Technology Services |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | Recruiting Services |
| IRS990/ContractorCompensationGrp/ServicesDesc | 2 | Communications Services |
| IRS990/ContractorCompensationGrp/ServicesDesc | 3 | Talent Advisory Services |
| IRS990/ContractorCompensationGrp/ServicesDesc | 4 | Career Development Services |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 19770580 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 0 |
| IRS990/CYOtherExpensesAmt | 0 | 36181503 |
| IRS990/CYOtherRevenueAmt | 0 | 2980055 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 37144085 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | -6707921 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 30421138 |
| IRS990/CYTotalExpensesAmt | 0 | 66602641 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 59894720 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | true |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 16430633 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 17099900 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 75394 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 325279 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 400673 |
| IRS990/Desc | 0 | EDX'S LARGEST PROGRAM SERVICE ACTIVITIES ARE TO DEVELOP A LEARNING PLATFORM AS OPEN SOURCE SOFTWARE AND TO HOST ITS PARTNERS COURSES ON THAT PLATFORM, IN ORDER TO PROVIDE HIGH QUALITY ONLINE EDUCATIONAL EXPERIENCES WORLDWIDE. TOTAL ENROLLMENTS WERE APPROXIMATELY 59 MILLION WITH OVER 2,635 ONLINE COURSES. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | true |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/ElectionOfBoardMembersInd | 0 | true |
| IRS990/EmployeeCnt | 0 | 201 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | true |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/ExpenseAmt | 0 | 54070130 |
| IRS990/FamilyOrBusinessRlnInd | 0 | true |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 25305 |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 109174 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 134479 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 49511 |
| IRS990/FeesForServicesLegalGrp/ProgramServicesAmt | 0 | 213610 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 263121 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 1605982 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 6928831 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 8534813 |
| IRS990/ForeignActivitiesInd | 0 | true |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignOfficeInd | 0 | true |
| IRS990/Form8282PropertyDisposedOfInd | 0 | true |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 2 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 5 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 6 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 19 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 21 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 22 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 23 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 0 | Anant Agarwal |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 1 | Alan Garber |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 2 | Martin Schmidt |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 3 | Jeff Bussgang |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 4 | Katherine Lapp |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 5 | Israel Ruiz |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 6 | Sanjay Sarma |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 7 | Michael Smith |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 8 | Alan Spoon |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 9 | Wendy Cebula |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 10 | Mark Haseltine |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 11 | Nell Ma'luf |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 12 | Adam Medros |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 13 | Risa Sparks |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 14 | Johannes Heinlein |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 15 | Iain Kennedy |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 16 | Alexandra Norkin |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 17 | Kathleen Pugh |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 18 | Lee Rubenstein |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 19 | Edward Batchelder |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 20 | Catherine Cho |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 21 | Lauren Holliday |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 22 | Steve Magoun |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 23 | John Schwartz |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 117749 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 193993 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 96171 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 141 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 43387 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 55668 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 58967 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 121447 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 34033 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 63472 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 38552 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 2886 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 28102 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 62168 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 27254 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 16 | 53694 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 62445 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 60910 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 61677 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 52288 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 21 | 37601 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 22 | 54104 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 23 | 29063 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 669781 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 431443 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 469331 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 287114 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 52601 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 176607 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 372428 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 257482 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 372542 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 296482 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 18 | 352319 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 19 | 261381 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 20 | 216547 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 21 | 223573 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 22 | 216915 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 23 | 197062 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 686907 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 681998 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 57900 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 693510 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 744243 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 505916 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 608935 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | CEO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Co-Chair |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Co-Chair |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | President (Outgoing) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | Interim President |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | Clerk |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | President and COO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | Treasurer (Outgoing) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | VP, Strategic Partnerships |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | VP, Product |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | VP, Marketing |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | VP, Educational Services |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | VP, Business Development |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | Software Architect |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | Director, Engineering |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | Senior Director, Product |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 22 | Senior Director, Strategic Partnerships |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 23 | Director, Business Development |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/FormationYr | 0 | 2012 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/GainOrLossGrp/OtherAmt | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 0 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 9 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossReceiptsAmt | 0 | 59894720 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IndependentAuditFinclStmtInd | 0 | true |
| IRS990/IndependentVotingMemberCnt | 0 | 1 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 102 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartIXInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 25526 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 110127 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 135653 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 16670 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 71920 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 88590 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 0 |
| IRS990/InvestmentsProgramRelatedGrp/BOYAmt | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 40 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 1816223 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 1044432 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 1041403 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 2857626 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LoansFromOfficersDirectorsGrp/EOYAmt | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembershipDuesAmt | 0 | 7449454 |
| IRS990/MembersOrStockholdersInd | 0 | true |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MiscellaneousRevenueGrp/ExclusionAmt | 0 | 0 |
| IRS990/MiscellaneousRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 0 |
| IRS990/MiscellaneousRevenueGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/MiscellaneousRevenueGrp/UnrelatedBusinessRevenueAmt | 0 | 0 |
| IRS990/MissionDesc | 0 | THE EDX MISSION IS TO EXPAND ACCESS TO EDUCATION AND BECOME A LEADING RESOURCE FOR LEARNERS AND LEARNING WORLDWIDE BY PROVIDING AND ENHANCING TEACHING AND LEARNING ON CAMPUS AND ONLINE THROUGH ADVANCED TECHNOLOGIES AND RESEARCH. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 8311736 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 1603815 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 581219 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 2507607 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 3088826 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 423528 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 1827264 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 2250792 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 0 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 0 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 1251159 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 5397987 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 6649146 |
| IRS990/OtherExpensesGrp/Desc | 0 | MATERIALS & SUPPLIES |
| IRS990/OtherExpensesGrp/Desc | 1 | OTHER EXPENSES |