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Accounts receivable, net - Additional information (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts receivable, net
Notes Receivable Current	¥ 5,235	¥ 12,209

X

- Definition

Represents amount of notes receivable, current.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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