XML 116 R96.htm IDEA: XBRL DOCUMENT
v3.19.1

Fair Value Measurement (Detail Textuals) - shares | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 29, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Pre-IPO Series C-2 convertible redeemable preferred shares |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Issuance of preferred shares | 483,702 | 483,702 | 0

X
- Definition Temporary equity stock issued during period. + References No definition available. + Details
Name: | tc_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | tc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=tc_SeriesC2ConvertibleRedeemablePreferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |