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, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Gross profit
Gross Profit	$ 14,716		$ 14,974		$ 42,749		$ 41,373
Depreciation expense
Depreciation expense	561		505		1,688		1,288
Operating income (loss)
Operating Income (Loss)	(424)		39		(5,399)		(4,509)
Total before intersegment adjustments [Member]
Gross profit
Gross Profit	14,716		14,975		42,749		41,368
Operating income (loss)
Operating Income (Loss)	809		1,612		(985)		1,563
Network Equipment [Member]
Gross profit
Gross Profit	11,062		12,041		33,007		33,990
Depreciation expense
Depreciation expense	459		406		1,428		988
Operating income (loss)
Operating Income (Loss)	(953)		87		(5,296)		(1,328)
Network Integration [Member]
Gross profit
Gross Profit	3,654		2,934		9,742		7,378
Depreciation expense
Depreciation expense	50		54		149		159
Operating income (loss)
Operating Income (Loss)	1,762		1,525		4,311		2,891
Corporate Unallocated and Intersegment Adjustments [Member]
Gross profit
Gross Profit	0	[1]	(1)	[1]	0	[1]	5	[1]
Operating income (loss)
Operating Income (Loss)	(1,233)	[1]	(1,573)	[1]	(4,414)	[1]	(6,072)	[1]
Corporate [Member]
Depreciation expense
Depreciation expense	$ 52		$ 45		$ 111		$ 141

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