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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Stockholders’ equity:    
Preferred stock Series A-2, convertible, par value (in dollars per share) $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock Series A-2, stated value $ 7,500glow_PreferredStockSeriesA2StatedValue $ 7,500glow_PreferredStockSeriesA2StatedValue
Preferred stock Series A-2, shares authorized 7,500us-gaap_PreferredStockSharesAuthorized 7,500us-gaap_PreferredStockSharesAuthorized
Preferred stock Series A-2, shares issued 53us-gaap_PreferredStockSharesIssued 53us-gaap_PreferredStockSharesIssued
Preferred stock Series A-2, shares outstanding 53us-gaap_PreferredStockSharesOutstanding 53us-gaap_PreferredStockSharesOutstanding
Preferred stock Series A-2, liquidation value $ 396,000us-gaap_PreferredStockLiquidationPreferenceValue $ 396,000us-gaap_PreferredStockLiquidationPreferenceValue
Common Stock, convertible, par value (in dollars per share) $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, shares authorized 150,000,000us-gaap_CommonStockSharesAuthorized 150,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, shares issued 35,872,000us-gaap_CommonStockSharesIssued 35,951,000us-gaap_CommonStockSharesIssued
Common Stock, shares outstanding 35,693,000us-gaap_CommonStockSharesOutstanding 35,911,000us-gaap_CommonStockSharesOutstanding
Treasury Stock, shares 179,000us-gaap_TreasuryStockShares 40,000us-gaap_TreasuryStockShares