Number of individual shareholders holding ownership interest in an entity.

No definition available.

Name:	coe_NumberOfIndividualShareholders
Namespace Prefix:	coe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership set aside for an employee option plan.

+ References

No definition available.

+ Details

Name:	coe_OwnershipPercentageForEmployeeOptionPlan
Namespace Prefix:	coe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118582676&loc=SL6759159-111685

+ Details

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_OwnershipAxis=coe_ChinaOnlineInnovationsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_BeneficialOwnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=coe_OnDemandEnglishInnovationsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=coe_BeijingDashengZhixingTechnologyCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_MajorityShareholderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_PrincipalOwnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Operations and Reorganization - History of the Group and Basis of Presentation for the Reorganization (Details) - shareholder	1 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2019	Jan. 05, 2012
China Online Innovations Inc.
Operations and Reorganization
Equity interest (as a percent)		99.99986%
China Online Innovations Inc. \| Individual shareholders
Operations and Reorganization
Number of individual shareholders/investors		7
Beneficial interest held		0.00014%
On Demand English Innovations Inc.
Operations and Reorganization
Equity interest (as a percent)		99.996%
On Demand English Innovations Inc. \| Individual shareholders
Operations and Reorganization
Number of individual shareholders/investors		5
Beneficial interest held		0.004%
Beijing Dasheng Zhixing Technology Co., Ltd
Operations and Reorganization
VIE interest (as a percent)		100.00%
Beijing Dasheng Zhixing Technology Co., Ltd \| Founding Shareholders
Operations and Reorganization
Percentage of ownership set aside for an employee option plan			15.00%
VIE interest (as a percent)	71.00%
Beijing Dasheng Zhixing Technology Co., Ltd \| Angel investors
Operations and Reorganization
VIE interest (as a percent)	29.00%
Number of individual shareholders/investors	2