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Equity-Based Compensation (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Options expired (in shares) | 50,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod |  |
Options exercised (in shares) | 50,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |
Stock issued for exercise of options, shares | 20,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities |  |
Treasury stock (in shares) | 40,000 us-gaap_TreasuryStockShares | 0 us-gaap_TreasuryStockShares |
Treasury stock, value | $ 66 us-gaap_TreasuryStockValueAcquiredCostMethod |  |
Issuance of restricted stock to settle accrued 2013 bonuses | 204 glow_StockIssuedDuringPeriodValueSettlementofLiabilities |  |
Stockholders' Equity Attributable to Parent | 7,967 us-gaap_StockholdersEquity | 9,669 us-gaap_StockholdersEquity | 13,003 us-gaap_StockholdersEquity
Treasury Stock [Member] |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Shares, Issued | 40,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Treasury stock, value | 66 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Stockholders' Equity Attributable to Parent | (66)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Additional Paid In Capital [Member] |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Issuance of restricted stock to settle accrued 2013 bonuses | 204 glow_StockIssuedDuringPeriodValueSettlementofLiabilities / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Stockholders' Equity Attributable to Parent | 178,476 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 177,357 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 166,481 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
2014 Equity Incentive Plan [Member] |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Number of shares available for grant | 4,400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = glow_EquityIncentivePlan2014Member |  |
Stock Options [Member] |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Number of stock options outstanding (in shares) | 1,350,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1,792,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1,857,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Options expired (in shares) | 50,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 14,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Options exercised (in shares) | 50,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 70,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Intrinsic value of vested options | 3 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 6 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Intrinsic value of unvested options | 7 glow_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 48 glow_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Intrinsic value of exercised options | 30 glow_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsExercisedIntrinsicvalue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 27 glow_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsExercisedIntrinsicvalue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Unrecognized stock-based compensation expense for stock options | 786 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Unrecognized stock-based compensation expense, stock options, upon change in control, value | 20 glow_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedStockOptionsToBeExpensedUponChangeInControl / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Unrecognized stock-based compensation expense, stock options, upon change in control, shares | 10,000 glow_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedStockOptionsSharesDependentUponChangeInControl / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Unrecognized stock-based compensation expense, stock options, amortized for weighted average period | 766 glow_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedStockOptionsToBeAmortizedOverWeightedAveragePeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Weighted average period for amortization of unrecognized stock-based compensation, stock options | 1 year 10 months 2 days |  |
Restricted stock compensation expense | 356 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 646 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Stock Options [Member] | 2007 Stock Incentive Plan [Member] |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Number of stock options outstanding (in shares) | 1,263,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = glow_StockIncentivePlan2007Member |  |
Stock Options [Member] | 2000 Stock Incentive Plan [Member] |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Number of stock options outstanding (in shares) | 87,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = glow_StockIncentivePlan2000Member |  |
Restricted Stock [Member] |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Unrecognized stock-based compensation expense for stock options | 689 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Unrecognized stock-based compensation expense, stock options, upon change in control, value | 38 glow_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedStockOptionsToBeExpensedUponChangeInControl / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Unrecognized stock-based compensation expense, stock options, upon change in control, shares | 15,000 glow_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedStockOptionsSharesDependentUponChangeInControl / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Unrecognized stock-based compensation expense, stock options, amortized for weighted average period | 651 glow_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedStockOptionsToBeAmortizedOverWeightedAveragePeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Weighted average period for amortization of unrecognized stock-based compensation, stock options | 2 years 7 months 24 days |  |
Restricted stock compensation expense | 244 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 557 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Less than 10% Stockholder [Member] | Employees [Member] |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Stockholder's ownership interest (less than) | 10.00%glow_StockholderOwnershipInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = glow_EmployeesMember / us-gaap_TitleOfIndividualAxis = glow_LessThan10StockholderMember |  |
Incentive stock options, exercise price, percent of fair value (less than) | 100.00%glow_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisePricePercentOfFairValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = glow_EmployeesMember / us-gaap_TitleOfIndividualAxis = glow_LessThan10StockholderMember |  |
10% or more Stockholder [Member] | Employees [Member] |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Stockholder's ownership interest (less than) | 10.00%glow_StockholderOwnershipInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = glow_EmployeesMember / us-gaap_TitleOfIndividualAxis = glow_A10OrMoreStockholderMember |  |
Incentive stock options, exercise price, percent of fair value (less than) | 110.00%glow_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisePricePercentOfFairValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = glow_EmployeesMember / us-gaap_TitleOfIndividualAxis = glow_A10OrMoreStockholderMember |  |
Awards to be Issued in Next Twelve Months [Member] | Restricted Stock [Member] |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Restricted stock compensation expense | $ 165 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_IncomeStatementLocationAxis = glow_AwardstobeIssuedinNextTwelveMonthsMember |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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