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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
Segment
Financial_Institution
Dec. 31, 2013
Dec. 31, 2014
Financial_Institution
Sep. 30, 2014
Segment
Jun. 30, 2014
Dec. 22, 2014
Individual
Jan. 14, 2014
Sep. 30, 2013
Mar. 31, 2014
Basis of Presentation and Significant Accounting Policies [Line Items]                  
Number of operating segment 3us-gaap_NumberOfOperatingSegments     1us-gaap_NumberOfOperatingSegments          
Number of reporting segment 1us-gaap_NumberOfReportableSegments                
Hosting agreement term 1 year                
Standard product warranty term minimum 90 days                
Standard product warranty term maximum 1 year                
Period of hosting contracts to customers 1 year                
Cash and cash equivalents with U.S. financial institutions $ 387,000us-gaap_DepositsAssets   $ 387,000us-gaap_DepositsAssets            
Number of major financial institutions with which cash and cash equivalents are deposited 2sofo_CashAndCashEquivalentsDepositedNumberOfMajorFinancialInstitutions   2sofo_CashAndCashEquivalentsDepositedNumberOfMajorFinancialInstitutions            
Cash and cash equivalents with foreign subsidiary financial institutions 2,400,000sofo_CashAndCashEquivalentsAtCarryingValueHeldByForeignSubsidiaries   2,400,000sofo_CashAndCashEquivalentsAtCarryingValueHeldByForeignSubsidiaries            
Accounts receivable, allowances 150,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent   150,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 150,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent          
Original maturity of cash and cash equivalents 3 months                
Cash and cash equivalents 2,811,000us-gaap_CashAndCashEquivalentsAtCarryingValue 3,097,000us-gaap_CashAndCashEquivalentsAtCarryingValue 2,811,000us-gaap_CashAndCashEquivalentsAtCarryingValue 4,344,000us-gaap_CashAndCashEquivalentsAtCarryingValue       3,482,000us-gaap_CashAndCashEquivalentsAtCarryingValue  
Credit period of accounts receivable 30 days                
Estimated economic life of the product 3 years                
Capitalized internal and external development costs, gross 533,000sofo_CapitalizationOfSoftwareDevelopmentCosts     533,000sofo_CapitalizationOfSoftwareDevelopmentCosts          
Total amortization expense of software development costs 44,000us-gaap_CapitalizedComputerSoftwareAmortization 44,000us-gaap_CapitalizedComputerSoftwareAmortization              
Gain on investment 1,400,000us-gaap_GainLossOnInvestments                
Tax expense on investment 901,000sofo_IncomeTaxExpenseBenefitFromEquityMethodInvestments                
Equity in earnings of investment in Mediasite KK   23,000us-gaap_IncomeLossFromEquityMethodInvestments              
Legal contingency settlement terms The key terms of the agreement were 1) grant non-revocable license of Astute patents to the Company; 2) grant a fully paid, non-refundable license of certain Sonic Foundry patents to Astute; 3) Both Astute and our customer agreed to identify three meetings they currently capture that the other party will not seek or respond to any request for proposal; and 4) payment of $1.35 million to Astute.                
Legal contingencies expense 428,000us-gaap_LossContingencyLossInPeriod                
Product right asset related to legal settlement 672,000us-gaap_LossContingencyReceivable   672,000us-gaap_LossContingencyReceivable            
Legal contingencies amount 0us-gaap_LitigationSettlementAmount     0us-gaap_LitigationSettlementAmount          
Weighted average grant date fair value of options granted $ 3.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue                
Unrecognized non vested stock based compensation 1,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized   1,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized            
Estimated forfeitures for unrecognized non vested stock based compensation 246,000sofo_ShareBasedCompensationArrangementsEstimatedForfeitures   246,000sofo_ShareBasedCompensationArrangementsEstimatedForfeitures            
Expected weighted average life of forfeited cost 2 years 4 months 24 days                
Stock-based compensation 317,000us-gaap_ShareBasedCompensation 282,000us-gaap_ShareBasedCompensation              
Cash received from exercises under all stock option plans and warrants 0us-gaap_ProceedsFromStockOptionsExercised 35,000us-gaap_ProceedsFromStockOptionsExercised              
Tax benefits realized for tax deductions from option exercises 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense              
Expected shares issued 150,000us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares   150,000us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares            
Number of complete employment days on first day of each offering period 90 days                
Employee not eligible to participate 5.00%sofo_EmployeeNotEligibleToParticipate                
Eligible employees contribution to purchase price 10.00%sofo_EligibleEmployeesContributionToPurchaseShares                
Restricted participant under purchase plan that exceeds rate of fair value of shares 25,000sofo_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumFairMarketValueOfSharesToBePurchasedByEmployee                
Restricted participant under purchase plan that exceeds number of shares 1,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee                
Offering period 6 months                
Purchase shares of common stock at a purchase price fair market 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent                
Shares available to issue 46,703us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP   46,703us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP            
Shares purchased by employees     5,780us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan            
Stock-based compensation 6,000us-gaap_AllocatedShareBasedCompensationExpense 3,000us-gaap_AllocatedShareBasedCompensationExpense              
Selling and marketing expenses [Member]                  
Basis of Presentation and Significant Accounting Policies [Line Items]                  
Stock-based compensation 196,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember		 184,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember		              
General and administrative expenses [Member]                  
Basis of Presentation and Significant Accounting Policies [Line Items]                  
Stock-based compensation 84,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 17,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		              
Product development expenses [Member]                  
Basis of Presentation and Significant Accounting Policies [Line Items]                  
Stock-based compensation 37,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 78,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		              
The Company [Member]                  
Basis of Presentation and Significant Accounting Policies [Line Items]                  
Payment for legal settlements         1,100,000us-gaap_PaymentsForLegalSettlements
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		        
Customer Related Litigation [Member]                  
Basis of Presentation and Significant Accounting Policies [Line Items]                  
Payment for legal settlements         1,350,000us-gaap_PaymentsForLegalSettlements
/ us-gaap_MajorCustomersAxis
= sofo_CustomerRelatedLitigationMember		        
Warrant [Member]                  
Basis of Presentation and Significant Accounting Policies [Line Items]                  
Warrants issued to individuals           74,802sofo_ClassOfWarrantOrRightIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		      
Number of individual issued warrants           2sofo_NumberOfIndividualToWhomWarrantsIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		      
Warrants expiration period           5 years      
Warrants exercise price           $ 14.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		      
Remaining contractual life of warrants outstanding 4 years 11 months 23 days                
Weighted average exercise price of warrants           $ 14.00sofo_ClassOfWarrantOrRightExercisableWeightedAverageExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		      
Fair value of warrants           $ 133,000us-gaap_WarrantsNotSettleableInCashFairValueDisclosure
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		      
Prior to Amendment [Member]                  
Basis of Presentation and Significant Accounting Policies [Line Items]                  
Expected shares issued                 100,000us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares
/ us-gaap_StatementScenarioAxis
= sofo_PriorToAmendmentMember
Mediasite KK [Member]                  
Basis of Presentation and Significant Accounting Policies [Line Items]                  
Equity method investment, ownership percentage   26.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember		         26.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember		    
Remaining percent of stock purchased             74.00%sofo_RemainingMinorityInterestOwnershipPercentageByParent
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember		    
Percent of stock             100.00%sofo_OwnershipPercentageAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember