Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 14,003	$ 14,353
Accumulated depreciation and amortization	(11,800)	(11,367)
Property and equipment, net	$ 2,203	2,986
Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Network equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 10,588	10,767
Network equipment and software | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Network equipment and software | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 3,059	3,190
Computer equipment and software | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Computer equipment and software | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	4 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 87	87
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 269	$ 309
Office furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Office furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	10 years