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, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Gross profit
Gross Profit	$ 19,226		$ 20,112		$ 55,339		$ 63,472
Depreciation expense
Depreciation expense	489		346		1,360		1,080
Operating income (loss)
Operating Income (Loss)	(1,050)		2,204		(8,029)		3,695
Operating Segments [Member]
Gross profit
Gross Profit	19,422		20,157		55,239		64,108
Operating income (loss)
Operating Income (Loss)	3,066		4,983		1,884		13,730
Network Equipment [Member]
Gross profit
Gross Profit	12,306		11,203		32,342		35,956
Depreciation expense
Depreciation expense	286		190		745		594
Operating income (loss)
Operating Income (Loss)	2,163		1,281		396		2,787
Network Integration [Member]
Gross profit
Gross Profit	7,116		8,954		22,897		28,152
Depreciation expense
Depreciation expense	155		106		472		354
Operating income (loss)
Operating Income (Loss)	903		3,702		1,488		10,943
Corporate Unallocated and Intersegment Adjustments [Member]
Gross profit
Gross Profit	(196)	[1]	(45)	[1]	100	[1]	(636)	[1]
Operating income (loss)
Operating Income (Loss)	(4,116)	[1]	(2,779)	[1]	(9,913)	[1]	(10,035)	[1]
Corporate [Member]
Depreciation expense
Depreciation expense	$ 48		$ 50		$ 143		$ 132

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