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Credit Arrangements - Additional Information (Detail) (USD $)
0 Months Ended 3 Months Ended 0 Months Ended
Jan. 10, 2014
May 31, 2013
Jun. 27, 2011
Mar. 24, 2014
Dec. 31, 2014
Jan. 27, 2015
Sep. 30, 2014
Jan. 14, 2014
Dec. 31, 2013
Dec. 16, 2013
Line of Credit Facility [Line Items]                    
Adjusted quick ratio   2.0sofo_AdjustedQuickRatio                
Total term loan         2,000,000sofo_MaximumAmountOfTermLoan          
Total term debt         2,400,000sofo_MaximumAmountOfTermDebt          
Revolving loan maturity date   Oct. 01, 2015 Oct. 01, 2013              
Interest rate on revolving line of credit for three quarters   0.75%sofo_DebtInstrumentInterestRateOnUnusedPortionPercentageRateRangeMinimum                
Interest rate if quick ratio threshold is not met   1.25%sofo_DebtInstrumentInterestRateOnUnusedPortionPercentageRateRangeIfQuickRatioIsBelowThreshold                
Interest rate on unused revolving loan facility   0.175%sofo_DebtInstrumentInterestRateOnUnusedPortionPercentageRateRangeMaximum                
Incremental interest rate added to Prime Rate 3.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1                  
Interest rate payable on subordinate note 6.50%sofo_NotesPayableInterestRate                  
Amount of common stock repurchased 1,000,000us-gaap_StockRepurchasedDuringPeriodValue                  
Mediasite KK [Member]                    
Line of Credit Facility [Line Items]                    
Ownership percentage               26.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember
26.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember
 
Notes payable outstanding         120,000us-gaap_LineOfCredit
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember
  170,000us-gaap_LineOfCredit
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember
     
Annual interest rate         1.575%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember
         
MediaMission Holding B.V. [Member]                    
Line of Credit Facility [Line Items]                    
Ownership percentage 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
                100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
Silicon Valley Bank [Member]                    
Line of Credit Facility [Line Items]                    
Adjusted quick ratio as above Silicon Valley Bank's prime rate         1.00%sofo_AdjustedQuickRatioPrimeRate
/ dei_LegalEntityAxis
= sofo_SiliconValleyBankMember
         
Adjusted quick ratio as percentage         8.75%sofo_AdjustedQuickRatioPercentage
/ dei_LegalEntityAxis
= sofo_SiliconValleyBankMember
         
Notes payable outstanding         1,700,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= sofo_SiliconValleyBankMember
  1,900,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= sofo_SiliconValleyBankMember
     
Annual interest rate         5.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ dei_LegalEntityAxis
= sofo_SiliconValleyBankMember
         
Credit facility for advances         2,800,000sofo_AmountAvailableUnderCreditFacilityForAdvance
/ dei_LegalEntityAxis
= sofo_SiliconValleyBankMember
         
Subordinated note payable [Member] | Mediasite KK [Member]                    
Line of Credit Facility [Line Items]                    
Interest rate payable on subordinate note               5.00%sofo_NotesPayableInterestRate
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Notes payable outstanding         1,600,000us-gaap_LineOfCredit
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  1,800,000us-gaap_LineOfCredit
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Annual interest rate         5.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
         
Subordinated note payable [Member] | MediaMission Holding B.V. [Member]                    
Line of Credit Facility [Line Items]                    
Interest rate payable on subordinate note                   6.50%sofo_NotesPayableInterestRate
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Notes payable outstanding         301,000us-gaap_LineOfCredit
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  628,000us-gaap_LineOfCredit
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Annual interest rate         6.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
         
Secured Revolving Line of Credit [Member]                    
Line of Credit Facility [Line Items]                    
Borrowing capacity under secured revolving line of credit     3,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
             
Adjusted quick ratio 1.5sofo_AdjustedQuickRatio
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
    1.25sofo_AdjustedQuickRatio
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
           
Repayment of loan 544,000us-gaap_RepaymentsOfBankDebt
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
                 
New term loan 2,500,000us-gaap_LongTermLoansFromBank
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
                 
Repayment terms 36 months                  
Incremental interest rate added to Prime Rate 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
                 
Interest rate payable on subordinate note 5.50%sofo_NotesPayableInterestRate
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
                 
Notes payable outstanding         0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
      0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
 
Prior to First Amendment [Member]                    
Line of Credit Facility [Line Items]                    
Adjusted quick ratio as above Silicon Valley Bank's prime rate         1.00%sofo_AdjustedQuickRatioPrimeRate
/ us-gaap_CreditFacilityAxis
= sofo_PriorToFirstAmendmentMember
         
Prior to Second Amendment [Member]                    
Line of Credit Facility [Line Items]                    
Adjusted quick ratio as above Silicon Valley Bank's prime rate         1.50%sofo_AdjustedQuickRatioPrimeRate
/ us-gaap_CreditFacilityAxis
= sofo_PriorToSecondAmendmentMember
         
Second Amended Agreement [Member]                    
Line of Credit Facility [Line Items]                    
Description of adjusted quick ratio         Greater than 2.0 to 1.0          
Adjusted quick ratio         2.00sofo_AdjustedQuickRatio
/ us-gaap_CreditFacilityAxis
= sofo_SecondAmendedAgreementMember
         
New Term Loan [Member]                    
Line of Credit Facility [Line Items]                    
Interest will accrue on the revolving line of credit         3.75%sofo_RevolvingLineOfCreditAccruedInterest
/ us-gaap_CreditFacilityAxis
= sofo_NewTermLoanMember
         
Interest will accrue on the revolving line of credit, option one         3.25%sofo_RevolvingLineOfCreditAccruedInterestOptionOne
/ us-gaap_CreditFacilityAxis
= sofo_NewTermLoanMember
         
Amortization period of term loan         36 months          
Subsequent Event [Member] | Secured Revolving Line of Credit [Member]                    
Line of Credit Facility [Line Items]                    
Borrowing capacity under secured revolving line of credit           4,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Revolving loan maturity date           Jan. 31, 2017        
Repayment of loan           1,665,000us-gaap_RepaymentsOfBankDebt
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
New term loan           2,500,000us-gaap_LongTermLoansFromBank
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Repayment terms           36 months        
Interest rate payable on subordinate note           5.50%sofo_NotesPayableInterestRate
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Term loan commitment fee payable           20,000sofo_TermLoanCommitmentAmount
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Amendment fee payable           5,000sofo_LineOfCreditFacilityAmendmentFee
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Adjusted quick ratio           1.25sofo_AdjustedQuickRatioForQuarterEndingMonths
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Adjusted quick ratio           1.1sofo_AdjustedQuickRatioForIntraQuarterMonths
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Subsequent Event [Member] | Secured Revolving Line of Credit [Member] | For the Quarters Ending June 30, 2015 [Member]                    
Line of Credit Facility [Line Items]                    
Debt service ratio           1.25sofo_DebtServiceRatio
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_StatementScenarioAxis
= sofo_PeriodOneMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Subsequent Event [Member] | Secured Revolving Line of Credit [Member] | For the Quarter Ending September 30, 2015 [Member]                    
Line of Credit Facility [Line Items]                    
Debt service ratio           1.5sofo_DebtServiceRatio
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_StatementScenarioAxis
= sofo_PeriodTwoMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Subsequent Event [Member] | Secured Revolving Line of Credit [Member] | For the Quarters Ending December 31, 2014 [Member]                    
Line of Credit Facility [Line Items]                    
Debt service ratio           1.25sofo_DebtServiceRatio
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_StatementScenarioAxis
= sofo_PeriodThreeMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Subsequent Event [Member] | Secured Revolving Line of Credit [Member] | For the Quarters Ending March 31, 2015 [Member]                    
Line of Credit Facility [Line Items]                    
Debt service ratio           1.0sofo_DebtServiceRatio
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_StatementScenarioAxis
= sofo_PeriodFourMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Minimum [Member]                    
Line of Credit Facility [Line Items]                    
Percentage of advance rate on domestic receivables         75.00%sofo_PercentageOfAdvanceRateOnDomesticReceivables
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
Minimum [Member] | Secured Revolving Line of Credit [Member]                    
Line of Credit Facility [Line Items]                    
Adjusted quick ratio 1.50sofo_AdjustedQuickRatio
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
                 
Minimum [Member] | New Term Loan [Member]                    
Line of Credit Facility [Line Items]                    
Adjusted quick ratio     1.75sofo_AdjustedQuickRatio
/ us-gaap_CreditFacilityAxis
= sofo_NewTermLoanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
             
Debt service coverage ratio     1.25sofo_CoverageRatioDebtService
/ us-gaap_CreditFacilityAxis
= sofo_NewTermLoanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
             
Minimum [Member] | Third Amendment [Member]                    
Line of Credit Facility [Line Items]                    
Adjusted quick ratio       1.25sofo_AdjustedQuickRatio
/ us-gaap_CreditFacilityAxis
= sofo_ThirdAmendmentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
           
Minimum [Member] | Subsequent Event [Member] | Secured Revolving Line of Credit [Member]                    
Line of Credit Facility [Line Items]                    
Annual commitment fee on the revolving line of credit           20,000us-gaap_LineOfCreditFacilityCommitmentFeeAmount
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Lien limit           400,000us-gaap_PurchaseObligation
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Maximum [Member]                    
Line of Credit Facility [Line Items]                    
Percentage of advance rate on domestic receivables         80.00%sofo_PercentageOfAdvanceRateOnDomesticReceivables
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
         
Maximum [Member] | Secured Revolving Line of Credit [Member]                    
Line of Credit Facility [Line Items]                    
Adjusted quick ratio 1.75sofo_AdjustedQuickRatio
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
                 
Maximum [Member] | Secured Revolving Line of Credit [Member] | Mediasite KK [Member]                    
Line of Credit Facility [Line Items]                    
Bank indebtedness 500,000sofo_BankIndebtedness
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediasiteKkMember
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
                 
Maximum [Member] | Third Amendment [Member]                    
Line of Credit Facility [Line Items]                    
Adjusted quick ratio       1.50sofo_AdjustedQuickRatio
/ us-gaap_CreditFacilityAxis
= sofo_ThirdAmendmentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
           
Maximum [Member] | Subsequent Event [Member] | Secured Revolving Line of Credit [Member]                    
Line of Credit Facility [Line Items]                    
Annual commitment fee on the revolving line of credit           26,667us-gaap_LineOfCreditFacilityCommitmentFeeAmount
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Lien limit           $ 800,000us-gaap_PurchaseObligation
/ us-gaap_CreditFacilityAxis
= sofo_SecuredRevolvingLineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember