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If the fair value of the reporting unit exceeds its carrying amount, goodwill is considered not impaired; otherwise, there is an indication that goodwill may be impaired and the amount of the loss, if any, is measured by performing step two. Under step two, the impairment loss, if any, is measured by comparing the implied fair value of the reporting unit goodwill with the carrying amount of goodwill.</font></p> <p style="FONT-FAMILY: times;"><font size="2">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Currently, we have one reporting unit, one operating segment and one reportable segment. At December&#160;31, 2013 and 2012, all of the goodwill was attributed to our reporting unit. We tested our goodwill for impairment using a market based approach and no impairment was identified as the fair value of our reporting unit was substantially in excess of its carrying amount. 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The initial term of our contracts with telecom operators and wholesale partners generally range from three to fifteen years and the agreements generally contain renewal clauses. 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For multiple-deliverable arrangements entered into or materially modified after January&#160;1, 2011 that are accounted for under ASC 605-25, we evaluate whether or not separate units of accounting exist and then allocate the arrangement consideration to all units of accounting based on the relative selling price method using estimated selling prices if vendor specific objective evidence and third party evidence is not available. We recognize the revenue associated with the separate units of accounting upon completion of such services or ratably over the wholesale service period for platform service arrangements and the term of the estimated customer relationship period for DAS arrangements.</font></p> <p style="FONT-FAMILY: times;"><font size="2">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Subscription fees from retail customers are paid monthly in advance and revenue is deferred for the portions of monthly recurring subscription fees collected in advance. 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