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Equity-Based Compensation (Nonvested Options) (Details) (Stock Options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Stock Options [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Nonvested options outstanding, beginning balance (in shares) | 1,382 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1,252 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Nonvested options, Granted (in shares) | 0 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedGrantedInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1,075 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedGrantedInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Nonvested options, Vested (in shares) | (597)glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (85)glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Nonvested options, Forfeited (in shares) | (163)glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (860)glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Nonvested options outstanding, ending balance (in shares) | 622 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1,382 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Share-based Compensation Arrangements by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] |  |
Nonvested options, Weighted Average Grant Date Fair Value, beginning balance (in dollars per share) | $ 1.57 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 2.27 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Nonvested options, Granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 1.39 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Nonvested options, Vested, Weighted Average Grant Date Fair Value (in dollars per share) | $ 1.46 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 1.43 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Nonvested options, Forfeited, Weighted Average Grant Date Fair Value (in dollars per share) | $ 2.20 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedForfeitedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 2.25 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedForfeitedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Nonvested options, Weighted Average Grant Date Fair Value, ending balance (in dollars per share) | $ 1.51 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 1.57 glow_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember

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- Definition Share-based Compensation Arrangements by Share-based Payment Award, Options, Nonvested, Forfeited in Period + References No definition available. + Details
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- Definition Share-based Compensation Arrangements by Share-based Payment Award, Options, Nonvested, Forfeited in Period, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Share-based Compensation Arrangements by Share-based Payment Award, Options, Nonvested, Granted in Period + References No definition available. + Details
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- Definition Share-based Compensation Arrangements by Share-based Payment Award, Options, Nonvested, Vested in Period + References No definition available. + Details
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- Definition Share-based Compensation Arrangements by Share-based Payment Award, Options, Nonvested, Vested in Period, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Share-based Compensation Arrangements by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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