Segment Reporting and Geographic Information (Statement of Operations Information by Business Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Gross profit
Gross Profit	$ 15,092	$ 14,782	$ 28,968	$ 28,033
Depreciation expense
Depreciation expense	576	504	1,106	1,128
Operating income (loss)
Operating income (loss)	803	(1,126)	(8)	(4,975)
Total before intersegment adjustments [Member]
Gross profit
Gross Profit	15,092	14,783	28,967	28,032
Operating income (loss)
Operating income (loss)	2,053	201	2,360	(1,793)
Network Equipment [Member]
Gross profit
Gross Profit	11,959	11,185	23,503	21,944
Depreciation expense
Depreciation expense	516	433	987	969
Operating income (loss)
Operating income (loss)	520	(1,503)	322	(4,343)
Network Integration [Member]
Gross profit
Gross Profit	3,133	3,598	5,464	6,088
Depreciation expense
Depreciation expense	31	51	61	100
Operating income (loss)
Operating income (loss)	1,533	1,704	2,038	2,550
Corporate Unallocated and Intersegment Adjustments [Member]
Gross profit
Gross Profit	0	(1)	1	1
Operating income (loss)
Operating income (loss)	(1,250)	(1,327)	(2,368)	(3,182)
Corporate [Member]
Depreciation expense
Depreciation expense	$ 29	$ 20	$ 58	$ 59