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OTHER NON-CURRENT LIABILITIES (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)
OTHER NON-CURRENT LIABILITIES
ADR reimbursement, non-current		¥ 8,135		¥ 5,936
Other non-current liabilities		8,135	$ 853	5,936
Reimbursements, other income	¥ 2,199	¥ 663
ADR reimbursement, current				¥ 2,199

X

- Definition

Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

American Depositary Receipts, Reimbursement, Current

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

American Depositary Receipts, Reimbursement, Noncurrent

+ References

No definition available.

+ Details

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Namespace Prefix:	yi_
Data Type:	xbrli:monetaryItemType
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X

- Definition

American Depositary Receipts, Reimbursements, Other Income

+ References

No definition available.

+ Details

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Namespace Prefix:	yi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Balance Type:	na
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