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Segment Information and Concentrations of Risk (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Net revenues by reportable segment:
Net revenues	$ 85,921	$ 100,150
Operating loss by reportable segment:
Operating loss	(9,185)	(37,827)
Identifiable assets by reportable segment:
Identifiable assets	155,683		161,531
Mobile Computing Products [Member]
Net revenues by reportable segment:
Net revenues	75,620	90,878
Operating loss by reportable segment:
Operating loss	(5,500)	(3,470)
Identifiable assets by reportable segment:
Identifiable assets	133,858		141,045
M2M Products and Solutions [Member]
Net revenues by reportable segment:
Net revenues	10,301	9,272
Operating loss by reportable segment:
Operating loss	(3,685)	(34,357)
Identifiable assets by reportable segment:
Identifiable assets	$ 21,825		$ 20,486

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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