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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 | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued |  |  |
Preferred shares outstanding | 0 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding |  |  |
Stock issued for conversion of convertible preferred stock, shares | 20,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities |  |  |  |
Payments related to preferred stock exchange | $ 5 glow_PaymentRelatedtoConversionofSecurities | $ 289 glow_PaymentRelatedtoConversionofSecurities |  |  |
Common stock issued to broker in connection with preferred stock exchange | 0 us-gaap_StockIssuedDuringPeriodValueIssuedForServices | 135 us-gaap_StockIssuedDuringPeriodValueIssuedForServices |  |  |
Accrued dividends | 40 us-gaap_DividendsPayableCurrent | 20 us-gaap_DividendsPayableCurrent |  |  |
Conversion price below this fair value of the common stock (in dollars per share) | $ 1.16 glow_ConversionPriceBelowthisFairValueoftheCommonStockPerShare |  |  |  |
Broker [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock issued for services, shares |  |  | 100,000 us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_CounterpartyNameAxis = glow_BrokerMember |  |
Common stock issued to broker in connection with preferred stock exchange |  |  | 135 us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_CounterpartyNameAxis = glow_BrokerMember |  |
Stock price (in dollars per share) |  |  | $ 1.35 us-gaap_SharePrice / us-gaap_CounterpartyNameAxis = glow_BrokerMember |  |
Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred shares authorized | 5,000,000 us-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 |  | 6,667,286 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Series B-1 Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred shares authorized | 100 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 100,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Shares outstanding | 0 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Preferred shares issued | 0 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 100,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Preferred shares outstanding | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 100,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Preferred stock, liquidation preference, value |  | 10,247 us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Convertible equity securities, conversion rate (in dollars per share) |  | $ 1.54 glow_EquitySecuritiesConvertibleConversionPrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Preferred stock, forgiveness of accrued dividends |  | 247 glow_PreferredStockDividendsForgivenessofAccruedDividends / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Series A-2 Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred shares authorized | 7,500 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |
Preferred shares issued | 53 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |
Preferred shares outstanding | 53 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |
Preferred stock stated value (per share) | $ 7,500 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |
Stock issued during period, conversion of convertible securities, price (in dollars per share) | $ 3.00 glow_StockIssuedDuringPeriodConversionOfConvertibleSecuritiesPrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  | $ 2.9844 glow_StockIssuedDuringPeriodConversionOfConvertibleSecuritiesPrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | $ 3.00 glow_StockIssuedDuringPeriodConversionOfConvertibleSecuritiesPrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Convertible preferred stock, shares issued upon conversion | 2,500 us-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 | $ 40 us-gaap_DividendsPayableCurrent / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | $ 20 us-gaap_DividendsPayableCurrent / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |
Series D Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred shares authorized | 4,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |
Preferred shares issued | 0 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |
Preferred shares outstanding | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |

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