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Common Stock (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 20, 2015
Dec. 31, 2014
Sep. 16, 2014
Class of Stock [Line Items]          
Capitalized stock issuance costs $ 180,000us-gaap_DeferredFinanceCostsGross     $ 192,000us-gaap_DeferredFinanceCostsGross  
Amortized financing costs charged against additional paid-in capital 22,000us-gaap_AmortizationOfFinancingCosts 22,000us-gaap_AmortizationOfFinancingCosts      
Common stock [Member]          
Class of Stock [Line Items]          
Common shares sold in stock offering (in shares) 17us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
MLV & Co. LLC [Member] | At Market Issuance Sales Agreement [Member] | Common stock [Member]          
Class of Stock [Line Items]          
Stock offering, maximum sales value         8,000,000glow_StockOfferingAuthorizedAmount
/ us-gaap_CounterpartyNameAxis
= glow_MLVCo.LLCMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= glow_AtMarketIssuanceSalesAgreementMember
Stock offering costs, commission percentage 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
   
Common shares sold in stock offering (in shares) 17us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_CounterpartyNameAxis
= glow_MLVCo.LLCMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= glow_AtMarketIssuanceSalesAgreementMember
       
Weighted-average selling price in common stock offering (in dollars per share) $ 1.11us-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 19,000us-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 commissions expense 18,000glow_ProceedsFromIssuanceofCommonStockNetofOfferingCosts
/ us-gaap_CounterpartyNameAxis
= glow_MLVCo.LLCMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= glow_AtMarketIssuanceSalesAgreementMember
       
Capitalized stock issuance costs 125,000us-gaap_DeferredFinanceCostsGross
/ us-gaap_CounterpartyNameAxis
= glow_MLVCo.LLCMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= glow_AtMarketIssuanceSalesAgreementMember
       
Amortized financing costs charged against additional paid-in capital $ 100,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_CounterpartyNameAxis
= glow_MLVCo.LLCMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= glow_AtMarketIssuanceSalesAgreementMember