Segment Reporting and Geographic Information (Revenues by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 38,905	$ 33,415
Before intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	38,928	35,934
Network Equipment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	20,946	20,419
Network Integration [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	17,982	15,515
Intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ (23)	$ (2,519)