Segment Reporting and Geographic Information (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment	Jun. 30, 2014 USD ($)	Dec. 31, 2014
Segment Reporting Information [Line Items]
Number of Business Segments | segment			2
Revenue	$ 42,714	$ 43,124	$ 81,487	$ 85,442
Network Integration [Member]
Segment Reporting Information [Line Items]
Revenue	18,195	21,355	34,783	41,408
Network Integration [Member] | Major Customer, One [Member]
Segment Reporting Information [Line Items]
Revenue	$ 8,700	$ 12,600	$ 16,900	$ 23,600
Network Integration [Member] | Major Customer, One [Member] | Customer Concentration Risk [Member] | Revenue [Member]
Segment Reporting Information [Line Items]
Concentration percentage	20.00%	29.00%	21.00%	28.00%
Network Integration [Member] | Major Customer, One [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Concentration percentage			9.00%		5.00%
Network Integration [Member] | Major Customer, Two [Member]
Segment Reporting Information [Line Items]
Revenue	$ 7,100	$ 7,700	$ 11,800	$ 14,200
Network Integration [Member] | Major Customer, Two [Member] | Customer Concentration Risk [Member] | Revenue [Member]
Segment Reporting Information [Line Items]
Concentration percentage	17.00%	18.00%	14.00%	17.00%
Network Integration [Member] | Major Customer, Two [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Concentration percentage			27.00%		29.00%
Network Equipment [Member]
Segment Reporting Information [Line Items]
Revenue	$ 24,536	$ 21,833	$ 46,813	$ 44,152