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RESTRICTED NET ASSETS (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
RESTRICTED NET ASSETS
Appropriations from after-tax profit to general reserve fund (as a percent)	10.00%
Limit of statutory reserve fund as a percentage of registered capital, after which allocations to statutory reserves are no longer required	50.00%
Appropriation to statutory reserve	¥ 0	¥ 0	¥ 0
Restricted share capital	¥ 1,667,461	¥ 1,531,183

X

- Definition

Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e)(3)(ii))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The percentage of net income after tax required for annual appropriation to statutory reserve.

+ References

No definition available.

+ Details

Name:	yi_AppropriationOfNetIncomeAfterTaxToStatutoryReserveRequirementPercentage
Namespace Prefix:	yi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of appropriation to statutory reserve made from after tax profit.

+ References

No definition available.

+ Details

Name:	yi_AppropriationToStatutoryReserve
Namespace Prefix:	yi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The percentage of reserve level threshold for mandatory appropriation.

+ References

No definition available.

+ Details

Name:	yi_ReserveLevelThresholdForMandatoryAppropriationPercentage
Namespace Prefix:	yi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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