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Commitments and Contingencies (Details) (USD $)
1 Months Ended 3 Months Ended
Aug. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Long-term Purchase Commitment [Line Items]        
Operating lease payments   $ 126,000us-gaap_OperatingLeasesRentExpenseNet $ 165,000us-gaap_OperatingLeasesRentExpenseNet  
Impairment charges   125,000us-gaap_OtherAssetImpairmentCharges 101,000us-gaap_OtherAssetImpairmentCharges  
Operating lease, contract termination payment 150,000glow_OperatingLeaseContractTerminationPayment      
Unrecorded claim, vendor   957,000us-gaap_OtherUnrecordedAmounts    
New Jersey [Member] | Property and equipment [Member]        
Long-term Purchase Commitment [Line Items]        
Impairment of long-lived assets to be disposed of   125,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_NJ
   
Pennsylvania [Member]        
Long-term Purchase Commitment [Line Items]        
Impairment charges     225,000us-gaap_OtherAssetImpairmentCharges
/ us-gaap_StatementGeographicalAxis
= stpr_PA
 
Pennsylvania [Member] | Property and equipment [Member]        
Long-term Purchase Commitment [Line Items]        
Impairment of long-lived assets to be disposed of     101,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_PA
 
Colorado [Member] | Comerica Bank [Member]        
Long-term Purchase Commitment [Line Items]        
Letters of credit outstanding, amount   $ 148,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LineOfCreditFacilityAxis
= glow_ComericaBankMember
/ us-gaap_StatementGeographicalAxis
= stpr_CO
  $ 185,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LineOfCreditFacilityAxis
= glow_ComericaBankMember
/ us-gaap_StatementGeographicalAxis
= stpr_CO