Commitments and Contingencies - Schedule of Significant Customers, Revenue Concentration Information (Details) (Sales)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Subsidiaries of AT&T Inc.
Concentration Risk [Line Items]
Percentage of revenue	63.50%	77.80%	62.30%	81.30%
DIRECTV
Concentration Risk [Line Items]
Percentage of revenue	21.90%	0.00%	21.80%	0.00%
Alcatel-Lucent
Concentration Risk [Line Items]
Percentage of revenue	3.90%	7.20%	4.10%	7.60%
Other
Concentration Risk [Line Items]
Percentage of revenue	10.70%	15.00%	11.80%	11.10%