Segment Reporting and Geographic Information (Revenues by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 42,714	$ 43,124	$ 81,487	$ 85,442
Before intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	42,731	43,188	81,596	85,560
Network Equipment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	24,536	21,833	46,813	44,152
Network Integration [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	18,195	21,355	34,783	41,408
Intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ (17)	$ (64)	$ (109)	$ (118)