v3.20.1

Commitments and Contingencies - Additional information (Details) - Agreement with Tsinghua University ¥ in Millions	Apr. 27, 2017 CNY (¥)
Long Term Purchase Commitment [Line Items]
Period covered by the purchase agreement	5 years
Maximum amount of funding support under certain circumstances	¥ 50.0
Amount of funding support to be paid in next three years	¥ 20.0

X

- Definition

The minimum amount the entity agreed to pay in the next three years under the long-term purchase commitment.

+ References

No definition available.

+ Details

Name:	aacg_AmountOfFundingSupportToBePaidInNextThreeYears
Namespace Prefix:	aacg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

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

X

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

X

- Definition

Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermPurchaseCommitmentPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=aacg_PurchaseAgreementWithTsinghuaUniversityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: