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Prepayment and other current assets - Movements in pre (Details) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)
Prepayment and other current assets
Additions	¥ 16,573
Balance at the end of the year	¥ 16,573

X

- Definition

The amount of allowance for Prepayment and other current assets period increase or decrease.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of prepayment and other current assets, allowance

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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