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Preferred Stock (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Oct. 31, 2013
Sep. 30, 2014
Jun. 30, 2014
Class of Stock [Line Items]          
Preferred shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued      
Preferred shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding      
Stock issued for conversion of convertible preferred stock, shares 20,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities        
Payments related to preferred stock exchange $ 5glow_PaymentRelatedtoConversionofSecurities $ 289glow_PaymentRelatedtoConversionofSecurities      
Common stock issued to broker in connection with preferred stock exchange 0us-gaap_StockIssuedDuringPeriodValueIssuedForServices 135us-gaap_StockIssuedDuringPeriodValueIssuedForServices      
Accrued dividends 40us-gaap_DividendsPayableCurrent 20us-gaap_DividendsPayableCurrent      
Conversion price below this fair value of the common stock (in dollars per share) $ 1.16glow_ConversionPriceBelowthisFairValueoftheCommonStockPerShare        
Broker [Member]          
Class of Stock [Line Items]          
Stock issued for services, shares     100,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_CounterpartyNameAxis
= glow_BrokerMember
   
Common stock issued to broker in connection with preferred stock exchange     135us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_CounterpartyNameAxis
= glow_BrokerMember
   
Stock price (in dollars per share)     $ 1.35us-gaap_SharePrice
/ us-gaap_CounterpartyNameAxis
= glow_BrokerMember
   
Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
       
Common Stock [Member]          
Class of Stock [Line Items]          
Stock issued for conversion of convertible preferred stock, shares   6,667,286us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Series B-1 Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred shares authorized 100us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
100,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
     
Shares outstanding 0us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Preferred shares issued 0us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
100,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
     
Preferred shares outstanding 0us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
100,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
     
Preferred stock, liquidation preference, value   10,247us-gaap_PreferredStockLiquidationPreferenceValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
     
Convertible equity securities, conversion rate (in dollars per share)   $ 1.54glow_EquitySecuritiesConvertibleConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
     
Preferred stock, forgiveness of accrued dividends   247glow_PreferredStockDividendsForgivenessofAccruedDividends
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
     
Series A-2 Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred shares authorized 7,500us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Preferred shares issued 53us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Preferred shares outstanding 53us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Preferred stock stated value (per share) $ 7,500us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Stock issued during period, conversion of convertible securities, price (in dollars per share) $ 3.00glow_StockIssuedDuringPeriodConversionOfConvertibleSecuritiesPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
    $ 2.9844glow_StockIssuedDuringPeriodConversionOfConvertibleSecuritiesPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 3.00glow_StockIssuedDuringPeriodConversionOfConvertibleSecuritiesPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Convertible preferred stock, shares issued upon conversion 2,500us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Preferred stock, cumulative dividend percentage rate (per annum) 5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Accrued dividends $ 40us-gaap_DividendsPayableCurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 20us-gaap_DividendsPayableCurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
     
Series D Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred shares authorized 4,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
       
Preferred shares issued 0us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
       
Preferred shares outstanding 0us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember