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RECEIVABLES & PAYABLES WITH BROKER DEALERS AND CLEARING ORGANIZATION - Additional information (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2025
RECEIVABLES & PAYABLES WITH BROKER DEALERS AND CLEARING ORGANIZATION
Losses on receivables from broker dealers or clearing organizations	$ 0	$ 0
Bad debt expense	$ 15,000	$ 396,826

X

- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

No definition available.

+ Details

Name:	atch_BadDebtExpense
Namespace Prefix:	atch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of loss pertaining to receivable from broker-dealers and clearing organizations.

+ References

No definition available.

+ Details

Name:	atch_LossesOnReceivableFromBrokerDealerAndClearingOrganization
Namespace Prefix:	atch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	srt_BrokersAndDealersAbstract
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration