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Property, equipment and software, net - Additional information (Details) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, equipment and software, net
Depreciation expenses of property, equipment and software	¥ 3.0	¥ 3.8	¥ 1.1
Estimated depreciation expenses for 2021	2.9
Estimated depreciation expenses for 2022	1.9
Estimated depreciation expenses for 2023	0.7
Estimated depreciation expenses for 2024	0.1
Estimated depreciation expenses for 2025	¥ 0.0

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

No definition available.

+ Details

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Namespace Prefix:	tc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of Finite Lived Intangible Assets Depreciation Expense Next Twelve Months.

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No definition available.

+ Details

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Namespace Prefix:	tc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of Finite Lived Intangible Assets Depreciation Expense Next Two Year.

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No definition available.

+ Details

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Namespace Prefix:	tc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of Finite Lived Intangible Assets Depreciation Expense Year Five.

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No definition available.

+ Details

Name:	tc_FiniteLivedIntangibleAssetsDepreciationExpenseYearFive
Namespace Prefix:	tc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amout of Finite Lived Intangible Assets Depreciation Expense Year Four.

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No definition available.

+ Details

Name:	tc_FiniteLivedIntangibleAssetsDepreciationExpenseYearFour
Namespace Prefix:	tc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of Finite Lived Intangible Assets Depreciation Expense Year Three.

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No definition available.

+ Details

Name:	tc_FiniteLivedIntangibleAssetsDepreciationExpenseYearThree
Namespace Prefix:	tc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration