Segment Reporting and Geographic Information (Revenues by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 38,175	$ 37,626	$ 77,080	$ 71,041
Before intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	38,235	41,079	77,163	77,013
Network Equipment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	21,100	21,519	42,046	41,938
Network Integration [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	17,135	19,560	35,117	35,075
Intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ (60)	$ (3,453)	$ (83)	$ (5,972)