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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Stockholders’ equity: |  |
Preferred Stock Series B-1, non-convertible, par value (in dollars per share) | $ 0.0001 glow_PreferredStockSeriesB1ParValue | $ 0.0001 glow_PreferredStockSeriesB1ParValue
Preferred Stock Series B-1, stated value | $ 100,000 glow_PreferredStockSeriesB1StatedValue | $ 100,000 glow_PreferredStockSeriesB1StatedValue
Preferred Stock Series B-1, shares authorized | 100 glow_PreferredStockSeriesB1SharesAuthorized | 100 glow_PreferredStockSeriesB1SharesAuthorized
Preferred Stock Series B-1, shares issued | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued
Preferred Stock Series B-1, shares outstanding | 0 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding
Preferred Stock Series B-1, liquidation value | 0 glow_PreferredStockSeriesB1LiquidationValue | 0 glow_PreferredStockSeriesB1LiquidationValue
Preferred stock Series A-2, convertible, par value (in dollars per share) | $ 0.0001 glow_PreferredStockSeriesA2ParValue | $ 0.0001 glow_PreferredStockSeriesA2ParValue
Preferred stock Series A-2, stated value | 7,500 glow_PreferredStockSeriesA2StatedValue | 7,500 glow_PreferredStockSeriesA2StatedValue
Preferred stock Series A-2, shares authorized | 7,500 glow_PreferredStockSeriesA2SharesAuthorized | 7,500 glow_PreferredStockSeriesA2SharesAuthorized
Preferred stock Series A-2, shares issued | 53 glow_PreferredstockSeriesA2Sharesissued | 53 glow_PreferredstockSeriesA2Sharesissued
Preferred stock Series A-2, shares outstanding | 53 glow_PreferredStockSeriesA2SharesOutstanding | 53 glow_PreferredStockSeriesA2SharesOutstanding
Preferred stock Series A-2, liquidation value | $ 396,000 glow_PreferredStockSeriesA2LiquidationValue | $ 396,000 glow_PreferredStockSeriesA2LiquidationValue
Common Stock, convertible, par value (in dollars per share) | $ 0.0001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.0001 us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, shares authorized | 150,000,000 us-gaap_CommonStockSharesAuthorized | 150,000,000 us-gaap_CommonStockSharesAuthorized
Common Stock, shares issued | 35,950,732 us-gaap_CommonStockSharesIssued | 35,306,169 us-gaap_CommonStockSharesIssued
Common Stock, shares outstanding | 35,950,732 us-gaap_CommonStockSharesOutstanding | 35,306,169 us-gaap_CommonStockSharesOutstanding
Treasury stock (in shares) | 40,000 us-gaap_TreasuryStockShares | 0 us-gaap_TreasuryStockShares

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