Segment Reporting and Geographic Information (Statement of Operations Information by Business Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Gross profit
Gross Profit	$ 13,372		$ 13,312		$ 26,399		$ 25,993
Depreciation expense
Depreciation expense	383		334		784		670
Operating income (loss)
Operating Income (Loss)	(535)		(1,244)		(4,548)		(4,889)
Total before intersegment adjustments [Member]
Gross profit
Gross Profit	13,370		13,162		26,393		25,698
Operating income (loss)
Operating Income (Loss)	379		1,268		(49)		908
Network Equipment [Member]
Gross profit
Gross Profit	11,183		9,993		21,949		20,037
Depreciation expense
Depreciation expense	283		230		583		459
Operating income (loss)
Operating Income (Loss)	(296)		(337)		(1,415)		(1,767)
Network Integration [Member]
Gross profit
Gross Profit	2,187		3,169		4,444		5,661
Depreciation expense
Depreciation expense	52		57		105		116
Operating income (loss)
Operating Income (Loss)	675		1,605		1,366		2,675
Corporate Unallocated and Intersegment Adjustments [Member]
Gross profit
Gross Profit	2	[1]	150	[1]	6	[1]	295	[1]
Operating income (loss)
Operating Income (Loss)	(914)	[1]	(2,512)	[1]	(4,499)	[1]	(5,797)	[1]
Corporate [Member]
Depreciation expense
Depreciation expense	$ 48		$ 47		$ 96		$ 95

[1] Adjustments reflect the elimination of intersegment revenue and profit in inventory.