Segment Information and Concentrations of Risk - Schedule of Net Revenues, Operating Loss and Identifiable Assets of Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Net revenues by reportable segment:
Net revenues	$ 48,284	$ 85,921
Operating loss by reportable segment:
Operating loss	(8,927)	(9,185)
Identifiable assets by reportable segment:
Identifiable assets	96,871		111,465
Mobile Computing Products [Member]
Net revenues by reportable segment:
Net revenues	36,198	75,620
Operating loss by reportable segment:
Operating loss	(6,126)	(5,500)
Identifiable assets by reportable segment:
Identifiable assets	80,235		96,516
M2M Products and Solutions [Member]
Net revenues by reportable segment:
Net revenues	12,086	10,301
Operating loss by reportable segment:
Operating loss	(2,801)	(3,685)
Identifiable assets by reportable segment:
Identifiable assets	$ 16,636		$ 14,949