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Significant Accounting Policies (Details 1) - Serviceproviders | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |
Total number of online advertising and promotional service providers | 32 | 21 | 17
Number of online service providers that accounted for 10% or more of the Group's online advertising and promotional service | 2 | 2 | 1
Total percentage of the Group's online advertising and promotional service expenses that were paid to these service providers who accounted for 10% or more of the Group's online advertising and promotional service expenses. | 43.00% | 50.00% | 59.00%

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- Definition Information about total number of online service providers that accounted for 10% or more of the Group's online advertising and promotional service. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents information about total percentage of the Group's online advertising and promotional service expenses that were paid to these service providers who accounted for 10% or more of the Group's online advertising and promotional service expenses. + References No definition available. + Details
Name: | tc_PercentageOfOnlineAdvertisingAndPromotionalServiceExpenses
Namespace Prefix: | tc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents information about total number of online advertising and promotional service providers. + References No definition available. + Details
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Namespace Prefix: | tc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
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