Concentration, Credit and Other Risks (Details) $ in Millions	Sep. 30, 2020 USD ($)
Concentration, Credit and Other Risks
Cash on hand and demand deposists at banks	$ 0.2

It represents cash on hand and demand deposists at banks which are unrestricted cash in advance of future investment.

No definition available.

Name:	idex_CashOnHandAndDemandDeposistsAtBanks
Namespace Prefix:	idex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant