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Additional Information - Condensed Financial Statements of the Parent Company - Condensed statements of operations and comprehensive loss (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Operating Expenses [Abstract]        
Selling and marketing expenses $ 42,861 ¥ 279,665 ¥ 572,040 ¥ 432,059
General and administrative expenses 15,145 98,820 103,890 84,360
Research and development expenses 5,252 34,267 43,339 19,262
Total operating expenses 63,258 412,752 719,269 535,681
Net loss attributable to ordinary shareholders (25,056) (163,478) (251,299) (78,700)
Accretions to preferred shares redemption value       35,066
Net loss (24,988) (163,034) (250,640) (113,766)
Foreign currency translation adjustments, net of nil tax (1,050) (6,853) 8,416 3,401
Reportable Legal Entities Member | Parent Company [Member]        
Operating Expenses [Abstract]        
Selling and marketing expenses 34 219 (256) (1,511)
General and administrative expenses (1,761) (11,492) (19,801) (12,936)
Research and development expenses 36 232 (422) (84)
Total operating expenses (1,691) (11,041) (20,479) (14,531)
Interest (expenses)/income, net 217 1,425 6,142 (1,470)
Change in fair value of warrant       (3,843)
Equity in loss of subsidiaries, VIEs and subsidiaries of VIEs (23,596) (153,967) (235,804) (58,864)
Others, net 84 549 (499) 8
Net loss attributable to ordinary shareholders (24,986) (163,034) (250,640) (78,700)
Accretions to preferred shares redemption value       (35,066)
Net loss (24,986) (163,034) (250,640) (113,766)
Foreign currency translation adjustments, net of nil tax (1,050) (6,853) 8,416 3,401
TuanChe Limited's shareholders $ (26,036) ¥ (169,887) ¥ (242,224) ¥ (110,365)