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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Product Revenues and Service revenues (Details) | 12 Months Ended
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Dec. 31, 2019 item
Product revenues |
Number of Drug Mall | 1
Warranty period | 30 days
Minimum percentage of surcharges and value added tax | 0.00%
Maximum percentage of surcharges and value added tax | 17.00%
Service revenues |
Number of performance obligation | 1

X
- Definition Maximum range of surcharges and value added tax ("VAT"). + References No definition available. + Details
Name: | yi_MaximumRangeOfSurchargesAndValueAddedTax
Namespace Prefix: | yi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum range of surcharges and value added tax ("VAT"). + References No definition available. + Details
Name: | yi_MinimumRangeOfSurchargesAndValueAddedTax
Namespace Prefix: | yi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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 the number of performance obligation. + References No definition available. + Details
Name: | yi_NumberOfPerformanceObligation
Namespace Prefix: | yi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Product Revenues [Abstract] + References No definition available. + Details
Name: | yi_ProductRevenuesAbstract
Namespace Prefix: | yi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Service Revenues [Abstract] + References No definition available. + Details
Name: | yi_ServiceRevenuesAbstract
Namespace Prefix: | yi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The time period in which a purchased product may be returned, when there is packing or delivery damage or other quality problems identified. + References No definition available. + Details
Name: | yi_WarrantyPeriod
Namespace Prefix: | yi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration