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, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Gross profit
Gross Profit	$ 14,782		$ 13,372		$ 28,033		$ 26,399
Depreciation expense
Depreciation expense	504		383		1,128		784
Operating income (loss)
Operating Income (Loss)	(1,126)		(535)		(4,975)		(4,548)
Total before intersegment adjustments [Member]
Gross profit
Gross Profit	14,783		13,370		28,032		26,393
Operating income (loss)
Operating Income (Loss)	201		379		(1,793)		(49)
Network Equipment [Member]
Gross profit
Gross Profit	11,185		11,183		21,944		21,949
Depreciation expense
Depreciation expense	433		283		969		583
Operating income (loss)
Operating Income (Loss)	(1,503)		(296)		(4,343)		(1,415)
Network Integration [Member]
Gross profit
Gross Profit	3,598		2,187		6,088		4,444
Depreciation expense
Depreciation expense	51		52		100		105
Operating income (loss)
Operating Income (Loss)	1,704		675		2,550		1,366
Corporate Unallocated and Intersegment Adjustments [Member]
Gross profit
Gross Profit	(1)	[1]	2	[1]	1	[1]	6	[1]
Operating income (loss)
Operating Income (Loss)	(1,327)	[1]	(914)	[1]	(3,182)	[1]	(4,499)	[1]
Corporate [Member]
Depreciation expense
Depreciation expense	$ 20		$ 48		$ 59		$ 96

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