Segment Reporting and Geographic Information - Textual (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended				12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012 segments	Sep. 30, 2012 Major Customer, One [Member] Network Integration [Member]	Sep. 30, 2011 Major Customer, One [Member] Network Integration [Member]	Sep. 30, 2012 Customer Concentration Risk [Member] Accounts Receivable [Member] Major Customer, One [Member] Network Integration [Member]	Dec. 31, 2011 Customer Concentration Risk [Member] Accounts Receivable [Member] Major Customer, One [Member] Network Integration [Member]	Sep. 30, 2012 Customer Concentration Risk [Member] Accounts Receivable [Member] Major Customer, Two [Member] Network Integration [Member]	Dec. 31, 2011 Customer Concentration Risk [Member] Accounts Receivable [Member] Major Customer, Two [Member] Network Integration [Member]
Segment Reporting Information [Line Items]
Number of Business Segments	2
Amount of Revenue from One Customer		$ 28.8	$ 31.9
Percentage of Revenue from One Customer		19.00%
Percentage of Accounts Receivable				7.00%	8.00%	19.00%	16.00%