Goodwill

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Goodwill	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill Goodwill represents the excess of the purchase price over the estimated fair value of the net tangible and identifiable intangible assets acquired in business combinations. Our annual impairment assessment is performed as of the fourth quarter of each year, and an assessment is performed at other times if an event occurs or circumstances change that would more likely than not reduce the fair value of the asset below its carrying value. If the carrying value of goodwill exceeds its fair value, an impairment loss is recognized. At the date of our annual assessment for 2013 and 2012, the fair value of our single reporting unit substantially exceeded its carrying value and therefore was not at risk of failing step one of ASC 350-20, Goodwill. As a result of the acquisition of the connected vehicle business of Agero in November 2013, we recorded additional goodwill of $389,462 during the year ended December 31, 2013. No indicators of impairment were noted subsequent to our annual impairment assessment. As of December 31, 2013, there were no indicators of impairment, and no impairment loss was recorded for goodwill during the years ended December 31, 2013, 2012 and 2011. As of December 31, 2013, the cumulative balance of goodwill impairments recorded since the Merger was $4,766,190, which was recognized during the year ended December 31, 2008. During the years ended December 31, 2013 and 2012, we reduced goodwill by $274 and $19,491, respectively, related to the subsequent exercise of certain stock options and vesting of certain restricted stock units that were recorded at fair value in connection with the Merger.