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Capital Lease Obligations (Future Minimum Commitments Under All Non-Cancelable Capital Leases) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Total  
2015, Total $ 42us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
2016, Total 1us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
Capital Lease Total 43us-gaap_CapitalLeasesFutureMinimumPaymentsDue
Interest  
2015, Interest 1glow_CapitalLeasesFutureMinimumInterestIncludedInPaymentDueInNextTwelveMonths
2016, Interest 0glow_CapitalLeasesFutureMinimumInterestIncludedInPaymentDueInTwoYears
Capital Lease Interest Total 1us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
Principal  
2015, Principal 41glow_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueInNextTwelveMonths
2016, Principal 1glow_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueInTwoYears
Capital Lease Principal Total $ 42us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments