Segment Reporting and Geographic Information (Revenues by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 38,773	$ 42,318
Before intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	38,864	42,372
Network Equipment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	22,276	22,319
Network Integration [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	16,588	20,053
Intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ (91)	$ (54)