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Employee Benefits (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Benefits
Medical and welfare defined contribution plan	¥ 13,091	¥ 38,183	¥ 21,869
Other employee benefits	310	969	2,741
Total	¥ 13,401	¥ 39,152	¥ 24,610

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- Definition

Amount of defined benefit plan cost (credit), classified as other.

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

Amount of expense for employee benefit and equity-based compensation.

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