Represents number of GTB tokens held.

No definition available.

Name:	idex_NumberOfGtbTokensHeld
Namespace Prefix:	idex_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents number of major supplier.

+ References

No definition available.

+ Details

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Namespace Prefix:	idex_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Identifies or describes the benchmark that serves as the denominator in the calculation of the percentage of concentration risk.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The aggregate cost of goods produced and sold and services rendered during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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+ Details

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_SupplierConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_CostOfGoodsTotalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=idex_LegacyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_OtherCommitmentsAxis=idex_LicensedContentCommitmentMember
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Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=idex_WecastServiceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	idex_DigitalCurrencyAxis=idex_GtDollarCoinsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Concentration, Credit and Other Risks - Major Suppliers (Details)	9 Months Ended			12 Months Ended
	Sep. 30, 2019 USD ($) item	Sep. 30, 2018 item	Sep. 30, 2017 USD ($)	Dec. 31, 2018 USD ($) customer	Dec. 31, 2017 USD ($) customer	Dec. 31, 2016 USD ($)
Digital currency [line items]
Insured deposit	$ 855,915			$ 0	$ 369,280
Major Suppliers \| Cost of revenues
Digital currency [line items]
Description of percentage of revenue for major supplier		more than 10
Number of suppliers \| item		2
Major Suppliers \| Accounts payable
Digital currency [line items]
Description of percentage of revenue for major supplier	more than 10	more than 10
Number of suppliers \| item	1	2
Legacy YOD \| Licensed Content Commitment
Digital currency [line items]
Cost of revenue						$ 17,700,000
Legacy YOD \| Major Suppliers \| Cost of revenues
Digital currency [line items]
Cost of revenue			$ 800,000
Legacy YOD \| Major Suppliers \| Cost of revenues \| Content partner
Digital currency [line items]
Description of percentage of revenue for major supplier				more than 10
Legacy YOD \| Major Suppliers \| Revenue
Digital currency [line items]
Revenue			$ 800,000
Wecast Services \| Major Suppliers \| Cost of revenues
Digital currency [line items]
Description of percentage of revenue for major supplier				more than 10	more than 10
Number of suppliers \| customer				3	5
Wecast Services \| Major Suppliers \| Accounts payable
Digital currency [line items]
Description of percentage of revenue for major supplier				more than	more than
Number of suppliers \| customer				2	2
GTBs
Digital currency [line items]
Number of GTB tokens held \| item	8,333,333