Capital Lease Obligations (Future Minimum Commitments Under All Non-Cancelable Captial Leases) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Total
2014, Total	$ 225
2015, Total	43
2016, Total	1
Capital Lease Total	269
Interest
2014, Interest	8
2015, Interest	1
2016, Interest	0
Capital Lease Interest Total	9
Principal
2014, Principal	217
2015, Principal	42
2016, Principal	1
Capital Lease Principal Total	$ 260

Capital Leases, Future Minimum Interest Included In Payment, Due In Next Twelve Months

No definition available.

Name:	glow_CapitalLeasesFutureMinimumInterestIncludedInPaymentDueInNextTwelveMonths
Namespace Prefix:	glow_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Capital Leases Future Minimum Interest Due in Three Years

+ References

No definition available.

+ Details

Name:	glow_CapitalLeasesFutureMinimumInterestIncludedInPaymentDueInThreeYears
Namespace Prefix:	glow_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Capital Leases, Future Minimum Interest Included In Payment, Due In Two Years

+ References

No definition available.

+ Details

Name:	glow_CapitalLeasesFutureMinimumInterestIncludedInPaymentDueInTwoYears
Namespace Prefix:	glow_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Capital Leases, Future Minimum Payments, Present Value of net Minimum Payments Due In Next Twelve Months

+ References

No definition available.

+ Details

Name:	glow_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueInNextTwelveMonths
Namespace Prefix:	glow_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Capital Leases Future Minimum Value in Three Years

+ References

No definition available.

+ Details

Name:	glow_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueInThreeYears
Namespace Prefix:	glow_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Capital Leases, Future Minimum Payments, Present Value of net Minimum Payments Due In Two Years

+ References

No definition available.

+ Details

Name:	glow_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueInTwoYears
Namespace Prefix:	glow_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum lease payments for capital leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

+ Details

Name:	us-gaap_CapitalLeasesFutureMinimumPaymentsDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum lease payments maturing in the next fiscal year following the latest fiscal year for capital leases.

+ References

+ Details

Name:	us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum lease payments maturing in the third fiscal year following the latest fiscal year for capital leases.

+ References

+ Details

Name:	us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum lease payments maturing in the second fiscal year following the latest fiscal year for capital leases.

+ References

+ Details

Name:	us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount necessary to reduce net minimum lease payments to present value for capital leases.

+ References

+ Details

Name:	us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

+ References

+ Details

Name:	us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_InterestExpenseAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LongTermDebtByMaturityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration