Segment Reporting and Geographic Information (Statement of Operations Information by Business Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Gross profit
Gross Profit	$ 14,974		$ 14,372		$ 41,373		$ 40,365
Depreciation expense
Depreciation expense	505		391		1,288		1,061
Operating income (loss)
Operating Income (Loss)	39		(2,120)		(4,509)		(7,009)
Total before intersegment adjustments [Member]
Gross profit
Gross Profit	14,975		14,567		41,368		40,265
Operating income (loss)
Operating Income (Loss)	1,612		1,995		1,563		2,905
Network Equipment [Member]
Gross profit
Gross Profit	12,041		12,306		33,990		32,342
Depreciation expense
Depreciation expense	406		286		988		745
Operating income (loss)
Operating Income (Loss)	87		2,163		(1,328)		396
Network Integration [Member]
Gross profit
Gross Profit	2,934		2,261		7,378		7,923
Depreciation expense
Depreciation expense	54		57		159		173
Operating income (loss)
Operating Income (Loss)	1,525	[1]	(168)	[1]	2,891	[1]	2,509	[1]
Corporate Unallocated and Intersegment Adjustments [Member]
Gross profit
Gross Profit	(1)	[1]	(195)	[1]	5	[1]	100	[1]
Operating income (loss)
Operating Income (Loss)	(1,573)	[2]	(4,115)	[2]	(6,072)	[2]	(9,914)	[2]
Corporate [Member]
Depreciation expense
Depreciation expense	$ 45		$ 48		$ 141		$ 143

[1] Includes a write-down of goodwill for the three and nine months ended September 30, 2012.

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