Property and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 15,152,000		$ 16,318,000
Accumulated depreciation	(10,896,000)		(11,580,000)
Property and equipment, Net	4,256,000		4,738,000
Depreciation expense	1,771,000		1,436,000
Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Network equipment and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	11,091,000		11,173,000
Network equipment and software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Network equipment and software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	2,388,000		2,736,000
Computer equipment and software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Computer equipment and software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	4 years
Collaboration equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	497,000		1,517,000
Estimated useful life	5 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	366,000	[1]	336,000	[1]
Leasehold improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 810,000		$ 556,000
Office furniture and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Office furniture and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years

[1] Depreciated over the shorter period of the estimated useful life (five years) or the lease term.