Segment Reporting and Geographic Information (Revenues by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 42,318	$ 38,905
Before intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	42,372	38,928
Network Equipment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	22,319	20,946
Network Integration [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	20,053	17,982
Intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ (54)	$ (23)