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Common Stock (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Sep. 16, 2014 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |
Amortization of offering costs | $ 89,000 us-gaap_AmortizationOfFinancingCosts | $ 976,000 us-gaap_AmortizationOfFinancingCosts |  |
Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Sale of common stock under sales agreement (shares) | 326 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Common Stock [Member] | MLV & Co. LLC [Member] | At Market Issuance Sales Agreement [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock offering, authorized amount |  |  | 8,000,000 glow_StockOfferingAuthorizedAmount / us-gaap_CounterpartyNameAxis = glow_MLVCo.LLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = glow_AtMarketIssuanceSalesAgreementMember |
Stock offering costs, commissions (percent) |  |  | 3.00%glow_StockOfferingCostsCommissionsPercentage / us-gaap_CounterpartyNameAxis = glow_MLVCo.LLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = glow_AtMarketIssuanceSalesAgreementMember | 3.00%glow_StockOfferingCostsCommissionsPercentage / us-gaap_CounterpartyNameAxis = glow_MLVCo.LLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = glow_AtMarketIssuanceSalesAgreementMember
Sale of common stock under sales agreement (shares) |  |  |  | 325 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_CounterpartyNameAxis = glow_MLVCo.LLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = glow_AtMarketIssuanceSalesAgreementMember
Sale of common stock, weighted-average (in dollars per share) | $ 1.28 us-gaap_SaleOfStockPricePerShare / us-gaap_CounterpartyNameAxis = glow_MLVCo.LLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = glow_AtMarketIssuanceSalesAgreementMember |  |  | $ 1.28 us-gaap_SaleOfStockPricePerShare / us-gaap_CounterpartyNameAxis = glow_MLVCo.LLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = glow_AtMarketIssuanceSalesAgreementMember
Proceeds from sale of common stock |  |  |  | 416,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_CounterpartyNameAxis = glow_MLVCo.LLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = glow_AtMarketIssuanceSalesAgreementMember
Proceeds from sale of common stock, net of offering costs |  |  |  | 377,000 glow_ProceedsFromIssuanceofCommonStockNetofOfferingCosts / us-gaap_CounterpartyNameAxis = glow_MLVCo.LLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = glow_AtMarketIssuanceSalesAgreementMember
Deferred offering costs | 125,000 us-gaap_DeferredFinanceCostsGross / us-gaap_CounterpartyNameAxis = glow_MLVCo.LLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = glow_AtMarketIssuanceSalesAgreementMember |  |  | 125,000 us-gaap_DeferredFinanceCostsGross / us-gaap_CounterpartyNameAxis = glow_MLVCo.LLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = glow_AtMarketIssuanceSalesAgreementMember
Amortization of offering costs |  |  |  | 25,000 us-gaap_AmortizationOfFinancingCosts / us-gaap_CounterpartyNameAxis = glow_MLVCo.LLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = glow_AtMarketIssuanceSalesAgreementMember
Common Stock [Member] | MLV & Co. LLC [Member] | At Market Issuance Sales Agreement [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Deferred offering costs | $ 14,000 us-gaap_DeferredFinanceCostsGross / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_CounterpartyNameAxis = glow_MLVCo.LLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = glow_AtMarketIssuanceSalesAgreementMember |  |  | $ 14,000 us-gaap_DeferredFinanceCostsGross / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_CounterpartyNameAxis = glow_MLVCo.LLCMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = glow_AtMarketIssuanceSalesAgreementMember

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