Stockholders' Equity - Schedule of Stock Based Compensation Expense for Awards Under Equity Plans (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$ 946,000	$ 460,000	$ 2,200,000	$ 902,000
Wireless Operations [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	700,000	300,000	1,500,000	800,000
Software Operations [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	200,000	200,000	700,000	100,000
2009 LTIP [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	0	241,000	0	655,000
2011 LTIP [Member] | Wireless Operations [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	702,000	0	1,378,000	0
2011 LTIP [Member] | Software Operations [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	204,000	167,000	662,000	90,000
Board of Directors Compensation [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$ 40,000	$ 52,000	$ 160,000	$ 157,000