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Significant Accounting Policies, Concentrations of Credit Risk, Accounts Receivable (Details) (Accounts Receivable [Member])
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Comcast [Member]
Dec. 31, 2013
Comcast [Member]
Mar. 31, 2014
Office Depot and OfficeMax [Member]
Dec. 31, 2013
Office Depot and OfficeMax [Member]
Concentration Risk [Line Items]            
Customer concentration risk     66.00% 78.00% 17.00% 12.00%
Minimum threshold for reporting concentration risk (in hundredths) 10.00% 10.00%