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Organization and Reorganization - Major vie's and major subsidiaries (Details)	12 Months Ended
	Dec. 31, 2020
TuanChe Information Limited ("TuanChe Information")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Year of incorporation	2012
Principal activities	Investment holding
Percentage of direct or indirect economic ownership	100.00%
TuanYuan Internet Technology (Beijing) Co., Ltd. ("TuanYuan")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Year of incorporation	2013
Principal activities	Technical support and consulting services, auto shows, special promotion events, virtual dealership, online marketing services
Percentage of direct or indirect economic ownership	100.00%
Longye
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Year of incorporation	2018
Principal activities	Investment holding
Percentage of direct or indirect economic ownership	100.00%
Longye
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Year of incorporation	2018
Principal activities	Investment holding
Percentage of direct or indirect economic ownership	100.00%
Beijing Sangu Maolu Information Technology Co., Ltd. ("Sangu Maolu")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Year of incorporation	2019
Principal activities	Technical support and consulting services
Percentage of direct or indirect economic ownership	100.00%
Chema Technology (Beijing) Co., Ltd. ("Chema")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Year of incorporation	2018
Principal activities	Technical support and consulting services
Percentage of direct or indirect economic ownership	100.00%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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