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, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Gross profit
Gross Profit	$ 18,954		$ 23,680		$ 36,113		$ 43,360
Depreciation expense
Depreciation expense	437		369		871		734
Operating income (loss)
Operating Income (Loss)	(3,354)		1,751		(6,979)		1,491
Operating Segments [Member]
Gross profit
Gross Profit	18,804		23,830		35,817		43,951
Operating income (loss)
Operating Income (Loss)	(843)		5,359		(1,182)		8,747
Network Equipment group [Member]
Gross profit
Gross Profit	9,993		13,163		20,037		24,753
Depreciation expense
Depreciation expense	230		190		459		404
Operating income (loss)
Operating Income (Loss)	(340)		956		(1,767)		1,506
Network Integration group [Member]
Gross profit
Gross Profit	8,811		10,667		15,780		19,198
Depreciation expense
Depreciation expense	160		124		317		248
Operating income (loss)
Operating Income (Loss)	(503)		4,403		585		7,241
Corporate Unallocated and Intersegment Adjustments [Member]
Gross profit
Gross Profit	150	[1]	(150)	[1]	296	[1]	(591)	[1]
Operating income (loss)
Operating Income (Loss)	(2,511)	[1]	(3,608)	[1]	(5,797)	[1]	(7,256)	[1]
Corporate [Member]
Depreciation expense
Depreciation expense	$ 47		$ 55		$ 95		$ 82

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