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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  |  |  |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) Segment | Dec. 31, 2014 Minimum [Member] | Dec. 31, 2014 Maximum [Member] | Dec. 31, 2014 Peoples' Republic of China [Member] USD ($) | Dec. 31, 2013 Peoples' Republic of China [Member] USD ($) | Dec. 31, 2014 United States and Hong Kong [Member] USD ($) | Dec. 31, 2013 United States and Hong Kong [Member] HKD | Mar. 19, 2015 Subsequent Event [Member] | Dec. 31, 2014 Sales Revenue, Net [Member] Customer | Dec. 31, 2013 Sales Revenue, Net [Member] Customer | Dec. 31, 2014 Accounts Receivable [Member] Customer | Dec. 31, 2013 Accounts Receivable [Member] Customer | Apr. 01, 2014 Advertising Display Equipment [Member] | Dec. 31, 2014 Advertising Display Equipment [Member] | Apr. 01, 2014 Scenario, Previously Reported [Member] Advertising Display Equipment [Member] | Dec. 31, 2014 Customer Concentration Risk [Member] Sales Revenue, Net [Member] Customers Outside China [Member] Maximum [Member] | Dec. 31, 2013 Customer Concentration Risk [Member] Sales Revenue, Net [Member] Customers Outside China [Member] Maximum [Member] | Dec. 31, 2014 Customer Concentration Risk [Member] Sales Revenue, Net [Member] Customer One [Member] | Dec. 31, 2013 Customer Concentration Risk [Member] Sales Revenue, Net [Member] Customer One [Member] | Dec. 31, 2014 Customer Concentration Risk [Member] Sales Revenue, Net [Member] Customer Two [Member] | Dec. 31, 2013 Customer Concentration Risk [Member] Sales Revenue, Net [Member] Customer Two [Member] | Dec. 31, 2014 Customer Concentration Risk [Member] Sales Revenue, Net [Member] Customer Three [Member] | Dec. 31, 2013 Customer Concentration Risk [Member] Sales Revenue, Net [Member] Customer Three [Member] | Dec. 31, 2014 Customer Concentration Risk [Member] Sales Revenue, Net [Member] Customer Four [Member] | Dec. 31, 2013 Customer Concentration Risk [Member] Sales Revenue, Net [Member] Customer Four [Member] | Dec. 31, 2014 Customer Concentration Risk [Member] Accounts Receivable [Member] Customer One [Member] | Dec. 31, 2013 Customer Concentration Risk [Member] Accounts Receivable [Member] Customer One [Member] | Dec. 31, 2014 Customer Concentration Risk [Member] Accounts Receivable [Member] Customer Two [Member] | Dec. 31, 2013 Customer Concentration Risk [Member] Accounts Receivable [Member] Customer Two [Member] | Dec. 31, 2014 Customer Concentration Risk [Member] Accounts Receivable [Member] Customer Three [Member] | Dec. 31, 2013 Customer Concentration Risk [Member] Accounts Receivable [Member] Customer Three [Member] | Dec. 31, 2013 Customer Concentration Risk [Member] Accounts Receivable [Member] Customer Four [Member] | Dec. 31, 2014 Supplier Concentration Risk [Member] Property, Plant and Equipment [Member] Supplier | Dec. 31, 2013 Supplier Concentration Risk [Member] Property, Plant and Equipment [Member] Supplier | Dec. 31, 2014 Supplier Concentration Risk [Member] Property, Plant and Equipment [Member] Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net losses | $ (3,533,000)us-gaap_NetIncomeLoss | $ (3,935,000)us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash used in operating activity | (900,000)us-gaap_NetCashProvidedByUsedInOperatingActivities | (5,088,000)us-gaap_NetCashProvidedByUsedInOperatingActivities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 4,178,000 us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | (134,388,000)us-gaap_RetainedEarningsAccumulatedDeficit | (130,855,000)us-gaap_RetainedEarningsAccumulatedDeficit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and bank deposits |  |  |  |  | 2,853,000 us-gaap_CashAndDueFromBanks / us-gaap_StatementGeographicalAxis = country_CN | 83,000 us-gaap_CashAndDueFromBanks / us-gaap_StatementGeographicalAxis = country_CN | 1,325,000 us-gaap_CashAndDueFromBanks / us-gaap_StatementGeographicalAxis = idi_UnitedStatesAndHongKongMember | 5,522,000 us-gaap_CashAndDueFromBanks / us-gaap_StatementGeographicalAxis = idi_UnitedStatesAndHongKongMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FDIC Insurance limit | 250,000 us-gaap_CashFDICInsuredAmount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable allowances accrued | 0 us-gaap_AllowanceForDoubtfulAccountsReceivable | 0 us-gaap_AllowanceForDoubtfulAccountsReceivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated life of property and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 5 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising service revenue recognition period |  |  | 3 days | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising and promotion costs | $ 153,000 us-gaap_MarketingAndAdvertisingExpense | $ 139,000 us-gaap_MarketingAndAdvertisingExpense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions to PRC employee |  | 21.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer contribution |  | 5.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized income tax positions | 50.00%idi_IncomeTaxBenefitRealizationProbabilityPercentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio | 0.2 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 | 0.2 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 |  |  |  |  |  |  | 0.2 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split description | 1-for-5 | 1-for-5 |  |  |  |  |  |  | 1-for-5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective date of reverse stock split | Mar. 19, 2015 | Mar. 19, 2015 |  |  |  |  |  |  | Mar. 19, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomersOutsideChinaMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomersOutsideChinaMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 20.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerOneMember | 22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerOneMember | 16.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerTwoMember | 17.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerTwoMember | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerThreeMember | 15.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerThreeMember | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerFourMember | 15.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerFourMember | 39.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerOneMember | 34.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerOneMember | 38.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerTwoMember | 24.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerTwoMember | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerThreeMember | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerThreeMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = idi_CustomerFourMember | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_PropertyPlantAndEquipmentMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_PropertyPlantAndEquipmentMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_PropertyPlantAndEquipmentMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Operating segments |  | 1 us-gaap_NumberOfOperatingSegments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers |  |  |  |  |  |  |  |  |  | 4 idi_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember | 4 idi_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember | 3 idi_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember | 4 idi_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of major suppliers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 idi_NumberOfMajorSuppliers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_PropertyPlantAndEquipmentMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember | 1 idi_NumberOfMajorSuppliers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_PropertyPlantAndEquipmentMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember |

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition For the entity and the disposal group, cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. + References No definition available. + Details
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- Definition For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1, 2, 3 -Article 9 + Details
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