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Discontinued operations - Additional information (Details) ¥ in Millions | 1 Months Ended
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Jun. 30, 2018 CNY (¥)
Discontinued operations |
Disposal of the discontinued business resulting a gain of disposal | ¥ 0.8

X
- Definition Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Includes discontinued operations. + References No definition available. + Details
Name: | tc_DisposalGroupDiscontinuedOperationGainLossOnDisposal
Namespace Prefix: | tc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration