Segment Information and Concentrations of Risk (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Net revenues by operating segment:
Net revenues by operating segment:	$ 118,021	$ 118,021	$ 202,596	$ 179,805
Operating income (loss) :
Operating loss	(4,445)	(3,101)	(42,272)	(25,171)
Identifiable assets by reportable segment:
Identifiable assets by reportable segment:	200,421		200,421		249,179
Mobile Computing Products [Member]
Net revenues by operating segment:
Net revenues by operating segment:	92,552	105,781	183,431	155,577
Operating income (loss) :
Operating loss	(718)	1,010	(4,188)	(15,670)
Identifiable assets by reportable segment:
Identifiable assets by reportable segment:	160,784		160,784		181,180
M2M Products and Solutions [Member]
Net revenues by operating segment:
Net revenues by operating segment:	9,894	12,240	19,165	24,228
Operating income (loss) :
Operating loss	(3,727)	(4,111)	(38,084)	(9,501)
Identifiable assets by reportable segment:
Identifiable assets by reportable segment:	$ 39,637		$ 39,637		$ 67,999