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Geographical Data - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting [Abstract] |  |  |  |  |
Material revenue attributable to individual foreign country | $ 0 | $ 0 | $ 0 | $ 0 |
Long lived assets located in domestic markets | 100.00% |  | 100.00% |  | 100.00%

X
- Definition Long Lived Assets Located in Domestic Markets + References No definition available. + Details
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Namespace Prefix: | glow_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Revenue Attributable to Individual Foreign Country + References No definition available. + Details
Name: | glow_RevenueAttributabletoIndividualForeignCountry
Namespace Prefix: | glow_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration