Name:	yi_BasisOfConsolidationAbstract
Namespace Prefix:	yi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The extended term of agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	yi_ExtendedTermOfAgreement
Namespace Prefix:	yi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The number of consecutive months to terminates the agreement or it is terminated in advance pursuant to other provisions of the agreement such as bankruptcy of one party or one party's failure to perform its obligation, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	yi_NumberOfConsecutiveMonthsToTerminateOrAdvanceTerminateOfAgreementFailureToPerformItsObligation
Namespace Prefix:	yi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the number of drug malls.

No definition available.

Name:	yi_NumberOfDrugMalls
Namespace Prefix:	yi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Represents number of individual shareholders nominated by the Founders.

No definition available.

Name:	yi_NumberOfShareholdersNominatedByFounders
Namespace Prefix:	yi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The prior notice period for termination of proxy agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	yi_PriorNoticePeriodForTerminationOfAgreement
Namespace Prefix:	yi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The term of agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.