Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Segment		Dec. 31, 2012		Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]
Equity method investments	$ 0		$ 0
Gain/loss from investment	0		0		0
Acquisition-related costs	1,658	[1]	704	[1]	1,608	[1]
Loss on disposition of other investment in Alanco					305
Extended warranty period	1 year
Estimated life of communicator	4 years
Foreign exchange gains (losses)	(32)		92		8
Maturity period of debt securities, minimum			3 months
Maturity period of debt securities, maximum			1 year
Depreciation	0
Interest expense capitalized	4,562		237		152
Amortization expense	0		0		0
Number of reporting segments	1
Impairment charges	$ 0		$ 0		$ 0
Warranty coverage on product sales estimated	1 year
Maximum percentage of benefit realized upon ultimate settlement	50.00%
StarTrak [Member]
Summary Of Significant Accounting Policies [Line Items]
Warranty coverage on product sales estimated	1 year
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Additional term of the agreement	2 years
Amortization of internal use software costs, useful life	3 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Additional term of the agreement	5 years
Amortization of internal use software costs, useful life	5 years

[1] Stock-based compensation included in costs and expenses: Costs of services $ 303 $ 286 $ 131 Costs of product sales 114 19 8 Selling, general and administrative 2,316 1,346 1,742 Product development 240 150 33 $ 2,973 $ 1,801 $ 1,914