Segment Reporting and Geographic Information - Revenues By Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 51,613	$ 54,193	$ 155,004	$ 166,596
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	54,073	57,573	163,436	178,550
Network Equipment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	23,310	23,193	65,248	70,442
Network Integration [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	30,763	34,380	98,188	108,108
Intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ (2,460)	$ (3,380)	$ (8,432)	$ (11,954)