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Accrued Sales Taxes and Regulatory Fees (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accrued Sales Taxes and Regulatory Fees [Roll Forward]    
Accrued sales taxes and regulatory fees $ 444glow_AccruedSalesTaxesAndRegulatoryFees $ 590glow_AccruedSalesTaxesAndRegulatoryFees