v3.20.1

Commitments and Contingencies - Additional information (Details) - Agreement with Tsinghua University ¥ in Millions | Apr. 27, 2017 CNY (¥)
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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: |