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Debt (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Mar. 01, 2015
Feb. 28, 2015
Oct. 17, 2013
Debt Instrument [Line Items]            
Deferred financing costs $ 180,000us-gaap_DeferredFinanceCostsGross   $ 192,000us-gaap_DeferredFinanceCostsGross      
Amortization of financing costs 22,000us-gaap_AmortizationOfFinancingCosts 22,000us-gaap_AmortizationOfFinancingCosts        
Current portion of long-term debt 400,000us-gaap_ShortTermBorrowings   400,000us-gaap_ShortTermBorrowings      
Prepaid expenses and other current assets [Member]            
Debt Instrument [Line Items]            
Unamortized debt issuance expense 83,000us-gaap_UnamortizedDebtIssuanceExpense
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
  84,000us-gaap_UnamortizedDebtIssuanceExpense
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
     
Promissory Note with Stockholder Representative [Member] | Promissory Note [Member]            
Debt Instrument [Line Items]            
Stated interest rate (percent)       15.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= glow_PromissoryNoteWithStockholderRepresentativeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= glow_PromissoryNoteWithStockholderRepresentativeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
 
SRS Note 1,785,000us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= glow_PromissoryNoteWithStockholderRepresentativeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
  1,785,000us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= glow_PromissoryNoteWithStockholderRepresentativeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
     
February 15, 2014 to April 15, 2015 [Member] | Comerica Term Loan [Member]            
Debt Instrument [Line Items]            
Debt instrument, principal payment as percentage of excess cash flow (percent) 33.00%glow_DebtInstrumentPrincipalPaymentPercentageOfExcessCashFlow
/ us-gaap_DebtInstrumentAxis
= glow_ComericaTermLoanMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
         
February 15, 2014 to April 15, 2015 [Member] | Promissory Note with Stockholder Representative [Member] | Promissory Note [Member]            
Debt Instrument [Line Items]            
Debt instrument, periodic principal payment 50,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= glow_PromissoryNoteWithStockholderRepresentativeMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
         
Debt instrument, additional periodic payment, principal, earnings benchmark, measurement period 3 months          
Debt instrument, additional periodic payment, principal, reduction to calculated payment 1,500,000glow_DebtInstrumentAdditionalPeriodicPaymentPrincipalReductionToCalculatedPayment
/ us-gaap_DebtInstrumentAxis
= glow_PromissoryNoteWithStockholderRepresentativeMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
         
August 15, 2015 to August 15, 2018 [Member] | Comerica Term Loan [Member]            
Debt Instrument [Line Items]            
Debt instrument, principal payment as percentage of excess cash flow (percent) 50.00%glow_DebtInstrumentPrincipalPaymentPercentageOfExcessCashFlow
/ us-gaap_DebtInstrumentAxis
= glow_ComericaTermLoanMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
         
August 15, 2015 to August 15, 2018 [Member] | Promissory Note with Stockholder Representative [Member] | Promissory Note [Member]            
Debt Instrument [Line Items]            
Debt instrument, additional periodic payment, principal, earnings benchmark, measurement period 6 months          
Debt instrument, additional periodic payment, principal, reduction to calculated payment 3,000,000glow_DebtInstrumentAdditionalPeriodicPaymentPrincipalReductionToCalculatedPayment
/ us-gaap_DebtInstrumentAxis
= glow_PromissoryNoteWithStockholderRepresentativeMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
         
Debt instrument, additional periodic payment, principal, percent of earnings benchmark (percent) 40.00%glow_DebtInstrumentAdditionalPeriodicPaymentPrincipalPercentOfEarningsBenchmark
/ us-gaap_DebtInstrumentAxis
= glow_PromissoryNoteWithStockholderRepresentativeMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
         
Term Loan [Member]            
Debt Instrument [Line Items]            
Stated interest rate (percent) 12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= glow_TermLoanMember
         
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Stated interest rate (percent) 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
         
Main Street Capital Corporation [Member] | Term Loan [Member]            
Debt Instrument [Line Items]            
Revolving loan facility, maximum borrowing capacity           11,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= glow_TermLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= glow_MainStreetCapitalCorporationMember
Main Street Term Loan 9,000,000us-gaap_SeniorNotes
/ us-gaap_CreditFacilityAxis
= glow_TermLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= glow_MainStreetCapitalCorporationMember
  9,000,000us-gaap_SeniorNotes
/ us-gaap_CreditFacilityAxis
= glow_TermLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= glow_MainStreetCapitalCorporationMember
     
Main Street Capital Corporation [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Revolving loan facility, maximum borrowing capacity           2,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= glow_MainStreetCapitalCorporationMember
Net payments on revolving loan facility $ 400,000us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= glow_MainStreetCapitalCorporationMember