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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