Operations and Reorganization - Out of period adjustment (Details)	12 Months Ended
Dec. 31, 2019 CNY (¥)
Operations and Reorganization
Amount of deductions from net revenues	¥ 2,501,000
Net revenues excluding out of period adjustment	¥ 1,480,994

Amount of out of period adjustment to deduct net revenues that should have been recognized in prior periods.

No definition available.

Name:	coe_OutOfPeriodAdjustmentToDeductNetRevenues
Namespace Prefix:	coe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration