Segment Reporting and Geographic Information - Revenues By Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 55,020	$ 59,232	$ 103,391	$ 112,403
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	58,474	63,107	109,363	120,977
Network Equipment group [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	21,519	24,733	41,938	47,249
Network Integration group [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	36,955	38,374	67,425	73,728
Intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ (3,454)	$ (3,875)	$ (5,972)	$ (8,574)