XML 74 R48.htm IDEA: XBRL DOCUMENT
v3.20.1

SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Basis of consolidation (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 item store | Sep. 30, 2013 shareholder
Basis of consolidation |  |
Number of Drug Mall | 1 |
Number of individual shareholders nominated by the Founders | shareholder |  | 2
Proxy Agreement |  |
Basis of consolidation |  |
Prior written notice period to terminate the agreement | 30 days |
Exclusive Support Service Agreement |  |
Basis of consolidation |  |
Term of agreement (in years) | 10 years |
Extended term of agreement (in years) | 10 years |
Consecutive months to terminate or advance terminate of agreement in failure to perform its obligation | 6 months |
China |  |
Basis of consolidation |  |
Number of Drugstore | store | 1 |
Number of Drug Mall | 1 |

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | yi_BasisOfConsolidationAbstract
Namespace Prefix: | yi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The extended term of agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | yi_ExtendedTermOfAgreement
Namespace Prefix: | yi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
Name: | yi_NumberOfConsecutiveMonthsToTerminateOrAdvanceTerminateOfAgreementFailureToPerformItsObligation
Namespace Prefix: | yi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of drug malls. + References No definition available. + Details
Name: | yi_NumberOfDrugMalls
Namespace Prefix: | yi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents number of individual shareholders nominated by the Founders. + References No definition available. + Details
Name: | yi_NumberOfShareholdersNominatedByFounders
Namespace Prefix: | yi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | yi_PriorNoticePeriodForTerminationOfAgreement
Namespace Prefix: | yi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The term of agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | yi_TermOfAgreement
Namespace Prefix: | yi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=yi_ProxyAgreementOfVieMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=yi_ExclusiveSupportServiceAgreementOfVieMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_CN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |