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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid concession approval fees   $ 6idi_PrepaidConcessionApprovalFees
Prepaid for procurement of advertising equipment 6idi_PrepaidForProcurementOfAdvertisingEquipment 65idi_PrepaidForProcurementOfAdvertisingEquipment
Prepaid for rent of advertising spaces 2us-gaap_PrepaidRent 207us-gaap_PrepaidRent
Rental deposits and other receivables 257us-gaap_OtherReceivablesNetCurrent 521us-gaap_OtherReceivablesNetCurrent
Total prepaid expenses and other current assets $ 265us-gaap_PrepaidExpenseAndOtherAssetsCurrent $ 799us-gaap_PrepaidExpenseAndOtherAssetsCurrent