Contingencies - Narrative (Details) (Pending Litigation [Member])	0 Months Ended
	Jun. 25, 2012 co-defendant complaint	Oct. 05, 2012 complaint	Jul. 27, 2012 complaint
Loss Contingencies [Line Items]
Number of complaints filed	4
Number of Co-defendants	1
Total number of customers cited as possible co-defendants	2
Number of complaints served			4
Number of complaints answered		4
SmartBeam [Member]
Loss Contingencies [Line Items]
Number of complaints filed	2
Number of patents infringed upon	1
Monitoring System Products [Member]
Loss Contingencies [Line Items]
Number of complaints filed	2
Number of patents infringed upon	2