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Commitments and Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Aug. 15, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Operating lease payments |  |  | $ 671 us-gaap_OperatingLeasesRentExpenseNet | $ 765 us-gaap_OperatingLeasesRentExpenseNet |
Loss on vacated office lease |  | 253 us-gaap_GainLossOnContractTermination |  |  |
Operating lease, contract termination payment | 150 glow_OperatingLeaseContractTerminationPayment |  |  |  |
Oxnard, California [Member] |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Operating lease, term |  |  |  |  | 64 months
Monthly rent expense |  |  |  |  | 7 glow_OperatingLeasesRentExpensePerMonth / us-gaap_StatementGeographicalAxis = glow_OxnardCaliforniaMember
Comerica Bank [Member] | Colorado [Member] |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Letters of credit outstanding, amount |  |  | $ 185 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LineOfCreditFacilityAxis = glow_ComericaBankMember / us-gaap_StatementGeographicalAxis = stpr_CO | $ 185 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LineOfCreditFacilityAxis = glow_ComericaBankMember / us-gaap_StatementGeographicalAxis = stpr_CO | $ 185 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LineOfCreditFacilityAxis = glow_ComericaBankMember / us-gaap_StatementGeographicalAxis = stpr_CO

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- Definition Operating Lease, Contract Termination Payment + References No definition available. + Details
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Namespace Prefix: | glow_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating Leases, Rent Expense, Per Month + References No definition available. + Details
Name: | glow_OperatingLeasesRentExpensePerMonth
Namespace Prefix: | glow_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |