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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