Segment, Customer Concentration and Geographical Information (Details Textual)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment and Geographical Information (Additional Textual) [Abstract]
Number of primary business units	2	2
Sprint [Member]
Segment and Geographical Information (Textual) [Abstract]
Percentage contribution to total revenue	40.70%	24.80%	13.90%
Verizon Wireless [Member]
Segment and Geographical Information (Textual) [Abstract]
Percentage contribution to total revenue	20.50%	18.40%	40.10%
AT&T [Member]
Segment and Geographical Information (Textual) [Abstract]
Percentage contribution to total revenue		11.70%	12.30%