v3.20.1

Income Taxes - Summary of Movements of Valuation Allowance (Details) - CNY (¥)	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Movements of the valuation allowance
Balance at the beginning of the period	¥ 26,584,197	¥ 21,275,591	¥ 35,845,674
Additions	9,261,477	23,437,979	11,024,410
Reduction due to gain from discharge of intercompany payables			(25,594,493)
Balance at the end of the period	¥ 35,845,674	¥ 44,713,570	¥ 21,275,591

X

- Definition

Deferred tax assets valuation allowance roll forward.

+ References

No definition available.

+ Details

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Namespace Prefix:	aacg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of decrease in valuation allowance for reduction due to gain from discharge of intercompany payables.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e32123-109318

+ Details

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